Fix heap buffer overflow (#1425338)
This commit is contained in:
Pavel Zhukov
parent
253456aea3
commit
71ac78f599
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@ -0,0 +1,91 @@
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From 1912de5f08e90af1d9d0a9791f58ba3afdb9d465 Mon Sep 17 00:00:00 2001
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From: Robin Watts <robin.watts@artifex.com>
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Date: Thu, 9 Feb 2017 15:49:15 +0000
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Subject: [PATCH 2/2] Bug 697500: Fix NULL ptr access.
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Cope better with errors during rendering - avoid letting the
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gstate stack get out of sync.
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This avoids us ever getting into the situation of popping
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a clip when we should be popping a mask or a group. This was
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causing an unexpected case in the painting.
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---
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source/pdf/pdf-op-run.c | 26 ++++++++++++++++++--------
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1 file changed, 18 insertions(+), 8 deletions(-)
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diff --git a/source/pdf/pdf-op-run.c b/source/pdf/pdf-op-run.c
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index a3ea895..f1eac8d 100644
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--- a/source/pdf/pdf-op-run.c
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+++ b/source/pdf/pdf-op-run.c
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@@ -1213,6 +1213,7 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
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pdf_run_processor *pr = (pdf_run_processor *)proc;
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pdf_gstate *gstate = NULL;
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int oldtop = 0;
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+ int oldbot = -1;
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fz_matrix local_transform = *transform;
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softmask_save softmask = { NULL };
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int gparent_save;
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@@ -1232,16 +1233,17 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
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fz_var(cleanup_state);
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fz_var(gstate);
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fz_var(oldtop);
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+ fz_var(oldbot);
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gparent_save = pr->gparent;
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pr->gparent = pr->gtop;
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+ oldtop = pr->gtop;
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fz_try(ctx)
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{
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pdf_gsave(ctx, pr);
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gstate = pr->gstate + pr->gtop;
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- oldtop = pr->gtop;
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pdf_xobject_bbox(ctx, xobj, &xobj_bbox);
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pdf_xobject_matrix(ctx, xobj, &xobj_matrix);
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@@ -1302,12 +1304,25 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
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doc = pdf_get_bound_document(ctx, xobj->obj);
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+ oldbot = pr->gbot;
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+ pr->gbot = pr->gtop;
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+
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pdf_process_contents(ctx, (pdf_processor*)pr, doc, resources, xobj->obj, NULL);
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}
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fz_always(ctx)
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{
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+ /* Undo any gstate mismatches due to the pdf_process_contents call */
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+ if (oldbot != -1)
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+ {
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+ while (pr->gtop > pr->gbot)
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+ {
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+ pdf_grestore(ctx, pr);
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+ }
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+ pr->gbot = oldbot;
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+ }
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+
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if (cleanup_state >= 3)
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- pdf_grestore(ctx, pr); /* Remove the clippath */
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+ pdf_grestore(ctx, pr); /* Remove the state we pushed for the clippath */
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/* wrap up transparency stacks */
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if (transparency)
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@@ -1341,13 +1356,8 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
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pr->gstate[pr->gparent].ctm = gparent_save_ctm;
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pr->gparent = gparent_save;
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- if (gstate)
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- {
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- while (oldtop < pr->gtop)
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- pdf_grestore(ctx, pr);
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-
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+ while (oldtop < pr->gtop)
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pdf_grestore(ctx, pr);
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- }
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pdf_unmark_obj(ctx, xobj->obj);
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}
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--
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2.9.3
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@ -0,0 +1,51 @@
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From 2c4e5867ee699b1081527bc6c6ea0e99a35a5c27 Mon Sep 17 00:00:00 2001
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From: Robin Watts <Robin.Watts@artifex.com>
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Date: Thu, 9 Feb 2017 07:12:16 -0800
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Subject: [PATCH 1/2] bug 697515: Fix out of bounds read in fz_subsample_pixmap
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Pointer arithmetic for final special case was going wrong.
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---
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source/fitz/pixmap.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/source/fitz/pixmap.c b/source/fitz/pixmap.c
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index a831712..f1291dc 100644
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--- a/source/fitz/pixmap.c
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+++ b/source/fitz/pixmap.c
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@@ -1104,6 +1104,7 @@ fz_subsample_pixmap_ARM(unsigned char *ptr, int w, int h, int f, int factor,
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"@STACK:r1,<9>,factor,n,fwd,back,back2,fwd2,divX,back4,fwd4,fwd3,divY,back5,divXY\n"
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"ldr r4, [r13,#4*22] @ r4 = divXY \n"
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"ldr r5, [r13,#4*11] @ for (nn = n; nn > 0; n--) { \n"
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+ "ldr r8, [r13,#4*17] @ r8 = back4 \n"
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"18: @ \n"
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"mov r14,#0 @ r14= v = 0 \n"
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"sub r5, r5, r1, LSL #8 @ for (xx = x; xx > 0; x--) { \n"
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@@ -1120,7 +1121,7 @@ fz_subsample_pixmap_ARM(unsigned char *ptr, int w, int h, int f, int factor,
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"mul r14,r4, r14 @ r14= v *= divX \n"
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"mov r14,r14,LSR #16 @ r14= v >>= 16 \n"
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"strb r14,[r9], #1 @ *d++ = r14 \n"
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- "sub r0, r0, r8 @ s -= back2 \n"
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+ "sub r0, r0, r8 @ s -= back4 \n"
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"subs r5, r5, #1 @ n-- \n"
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"bgt 18b @ } \n"
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"21: @ \n"
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@@ -1249,6 +1250,7 @@ fz_subsample_pixmap(fz_context *ctx, fz_pixmap *tile, int factor)
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x += f;
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if (x > 0)
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{
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+ int back4 = x * n - 1;
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div = x * y;
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for (nn = n; nn > 0; nn--)
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{
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@@ -1263,7 +1265,7 @@ fz_subsample_pixmap(fz_context *ctx, fz_pixmap *tile, int factor)
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s -= back5;
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}
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*d++ = v / div;
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- s -= back2;
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+ s -= back4;
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}
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}
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}
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--
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2.9.3
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10
mupdf.spec
10
mupdf.spec
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@ -1,6 +1,6 @@
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Name: mupdf
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Version: 1.10a
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Release: 3%{?dist}
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Release: 4%{?dist}
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Summary: A lightweight PDF viewer and toolkit
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Group: Applications/Publishing
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License: GPLv3
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@ -12,6 +12,9 @@ BuildRequires: openjpeg2-devel jbig2dec-devel desktop-file-utils
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BuildRequires: libjpeg-devel freetype-devel libXext-devel curl-devel
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BuildRequires: harfbuzz-devel
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Patch0: %{name}-1.10a-openjpeg.patch
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## https://bugzilla.redhat.com/show_bug.cgi?id=1425338
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Patch1: %{name}-Bug-697500-Fix-NULL-ptr-access.patch
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Patch2: %{name}-bug-697515-Fix-out-of-bounds-read-in-fz_subsample_pi.patch
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%description
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MuPDF is a lightweight PDF viewer and toolkit written in portable C.
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@ -42,6 +45,8 @@ applications that use mupdf and static libraries
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%setup -q -n %{name}-%{version}-source
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rm -rf thirdparty
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%patch0 -p1
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%patch1 -p1
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%patch2 -p1
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%build
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export CFLAGS="%{optflags} -fPIC -DJBIG_NO_MEMENTO -DTOFU -DTOFU_CJK"
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@ -79,6 +84,9 @@ update-desktop-database &> /dev/null || :
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%{_libdir}/lib%{name}*.a
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%changelog
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* Thu Mar 2 2017 Pavel Zhukov <landgraf@fedoraproject.org> - 1.10a-4
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- fix buffer overflow (#1425338)
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* Thu Mar 02 2017 Michael J Gruber <mjg@fedoraproject.org> - 1.10a-3
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- Several packaging fixes
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