Linux v3.3-rc6-131-g097d591
This commit is contained in:
Dave Jones
parent
b183b702f7
commit
43c809527e
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From 5bccda0ebc7c0331b81ac47d39e4b920b198b2cd Mon Sep 17 00:00:00 2001
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From: Jeff Layton <jlayton@redhat.com>
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Date: Thu, 23 Feb 2012 09:37:45 -0500
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Subject: [PATCH] cifs: fix dentry refcount leak when opening a FIFO on lookup
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The cifs code will attempt to open files on lookup under certain
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circumstances. What happens though if we find that the file we opened
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was actually a FIFO or other special file?
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Currently, the open filehandle just ends up being leaked leading to
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a dentry refcount mismatch and oops on umount. Fix this by having the
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code close the filehandle on the server if it turns out not to be a
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regular file. While we're at it, change this spaghetti if statement
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into a switch too.
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Cc: stable@vger.kernel.org
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Reported-by: CAI Qian <caiqian@redhat.com>
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Tested-by: CAI Qian <caiqian@redhat.com>
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Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
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Signed-off-by: Jeff Layton <jlayton@redhat.com>
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Signed-off-by: Steve French <smfrench@gmail.com>
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---
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fs/cifs/dir.c | 20 ++++++++++++++++++--
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1 files changed, 18 insertions(+), 2 deletions(-)
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diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
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index 63a196b..bc7e244 100644
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--- a/fs/cifs/dir.c
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+++ b/fs/cifs/dir.c
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@@ -584,10 +584,26 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
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* If either that or op not supported returned, follow
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* the normal lookup.
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*/
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- if ((rc == 0) || (rc == -ENOENT))
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+ switch (rc) {
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+ case 0:
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+ /*
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+ * The server may allow us to open things like
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+ * FIFOs, but the client isn't set up to deal
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+ * with that. If it's not a regular file, just
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+ * close it and proceed as if it were a normal
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+ * lookup.
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+ */
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+ if (newInode && !S_ISREG(newInode->i_mode)) {
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+ CIFSSMBClose(xid, pTcon, fileHandle);
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+ break;
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+ }
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+ case -ENOENT:
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posix_open = true;
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- else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
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+ case -EOPNOTSUPP:
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+ break;
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+ default:
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pTcon->broken_posix_open = true;
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+ }
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}
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if (!posix_open)
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rc = cifs_get_inode_info_unix(&newInode, full_path,
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--
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1.7.0.4
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13
kernel.spec
13
kernel.spec
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@ -54,7 +54,7 @@ Summary: The Linux kernel
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# For non-released -rc kernels, this will be appended after the rcX and
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# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
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#
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%global baserelease 3
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%global baserelease 1
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%global fedora_build %{baserelease}
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# base_sublevel is the kernel version we're starting with and patching
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@ -87,7 +87,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%define rcrev 6
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# The git snapshot level
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%define gitrev 0
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%define gitrev 1
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# Set rpm version accordingly
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%define rpmversion 3.%{upstream_sublevel}.0
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%endif
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@ -774,9 +774,6 @@ Patch21290: ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
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#rhbz 727865 730007
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Patch21300: ACPICA-Fix-regression-in-FADT-revision-checks.patch
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#rhbz 798296
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Patch21301: cifs-fix-dentry-refcount-leak-when-opening-a-FIFO.patch
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#rhbz 728478
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Patch21302: sony-laptop-Enable-keyboard-backlight-by-default.patch
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@ -1501,9 +1498,6 @@ ApplyPatch ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
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#rhbz 727865 730007
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ApplyPatch ACPICA-Fix-regression-in-FADT-revision-checks.patch
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#rhbz 798296
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ApplyPatch cifs-fix-dentry-refcount-leak-when-opening-a-FIFO.patch
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#rhbz 728478
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ApplyPatch sony-laptop-Enable-keyboard-backlight-by-default.patch
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@ -2393,6 +2387,9 @@ fi
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# '-' | |
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# '-'
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%changelog
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* Wed Mar 07 2012 Dave Jones <davej@redhat.com> - 3.3.0-0.rc6.git1.1
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- Linux v3.3-rc6-131-g097d591
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* Mon Mar 05 2012 Dave Jones <davej@redhat.com> - 3.3.0-0.rc6.git0.3
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- Reenable debugging options.
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1
sources
1
sources
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@ -1,3 +1,4 @@
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364066fa18767ec0ae5f4e4abcf9dc51 linux-3.2.tar.xz
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02c210a8fd24acca8c1ac93f6f1d3913 compat-wireless-2012-02-05.tar.bz2
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cb0886dd96efbacc0c4923d36003b340 patch-3.3-rc6.xz
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20ca19d241eda3dd11fadc885c9ebe27 patch-3.3-rc6-git1.xz
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10
utrace.patch
10
utrace.patch
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@ -1873,15 +1873,15 @@ index e2cd3e2..fa40928 100644
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ftrace_graph_init_task(p);
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rt_mutex_init_task(p);
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@@ -1550,6 +1555,8 @@ long do_fork(unsigned long clone_flags,
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init_completion(&vfork);
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@@ -1583,6 +1583,8 @@ long do_fork(unsigned long clone_flags,
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get_task_struct(p);
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}
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+ UTRACE_HOOK(current, CLONE, report_clone(clone_flags, p));
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+
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/*
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* We set PF_STARTING at creation in case tracing wants to
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* use this to distinguish a fully live task from one that
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wake_up_new_task(p);
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/* forking complete and child started to run, tell ptracer */
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@@ -1561,6 +1568,8 @@ long do_fork(unsigned long clone_flags,
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wake_up_new_task(p);
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