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Avoid using stack variables in ums_realtek (again) (rhbz 795544)

This commit is contained in:
Josh Boyer 2012-02-20 16:20:25 -05:00
parent 0297ab965a
commit c08cca5888
2 changed files with 59 additions and 2 deletions
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13
kernel.spec
View File

@ -772,6 +772,9 @@ Patch21238: x86-Avoid-invoking-RCU-when-CPU-is-idle.patch
#rhbz 790367
Patch21239: s390x-enable-keys-compat.patch
#rhbz 795544
Patch21240: ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
# compat-wireless patches
Patch50000: compat-wireless-config-fixups.patch
Patch50001: compat-wireless-pr_fmt-warning-avoidance.patch
@ -1492,6 +1495,9 @@ ApplyPatch x86-Avoid-invoking-RCU-when-CPU-is-idle.patch
#rhbz 790367
ApplyPatch s390x-enable-keys-compat.patch
#rhbz 795544
ApplyPatch ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
# END OF PATCH APPLICATIONS
%endif
@ -2380,13 +2386,16 @@ fi
# '-' | |
# '-'
%changelog
* Mon Feb 20 2012 Josh Boyer <jwboyer@redhat.com>
- Avoid using stack variables in ums_realtek (again) (rhbz 795544)
* Mon Feb 20 2012 Dave Jones <davej@redhat.com>
- NFSv4: Fix an Oops in the NFSv4 getacl code
* Mon Feb 20 2012 Josh Boyer <jwboyer@gmail.com> - 3.3.0-0.rc4.git0.2
* Mon Feb 20 2012 Josh Boyer <jwboyer@redhat.com> - 3.3.0-0.rc4.git0.2
- Reenable debugging options.
* Sun Feb 19 2012 Josh Boyer <jwboyer@gmail.com> - 3.3.0-0.rc4.git0.1
* Sun Feb 19 2012 Josh Boyer <jwboyer@redhat.com> - 3.3.0-0.rc4.git0.1
- Linux 3.3-rc4
- Disable debugging options.

48
ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch Normal file
View File

@ -0,0 +1,48 @@
From dadfe1ad137e6fbe251b4a5dc310840cfe414db4 Mon Sep 17 00:00:00 2001
From: Josh Boyer <jwboyer@redhat.com>
Date: Mon, 20 Feb 2012 15:28:39 -0500
Subject: [PATCH] ums_realtek: do not use stack memory for DMA in
__do_config_autodelink
__do_config_autodelink passes the data variable to the transport function.
If the calling functions pass a stack variable, this will eventually trigger
a DMA-API debug backtrace for mapping stack memory in the DMA buffer. Fix
this by calling kmemdup for the passed data instead.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
---
drivers/usb/storage/realtek_cr.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
index d32f720..eee2a96 100644
--- a/drivers/usb/storage/realtek_cr.c
+++ b/drivers/usb/storage/realtek_cr.c
@@ -507,9 +507,14 @@ static int __do_config_autodelink(struct us_data *us, u8 *data, u16 len)
{
int retval;
u8 cmnd[12] = {0};
+ u8 *buf;
US_DEBUGP("%s, addr = 0xfe47, len = %d\n", __FUNCTION__, len);
+ buf = kmemdup(data, len, GFP_NOIO);
+ if (!buf)
+ return USB_STOR_TRANSPORT_ERROR;
+
cmnd[0] = 0xF0;
cmnd[1] = 0x0E;
cmnd[2] = 0xfe;
@@ -517,7 +522,8 @@ static int __do_config_autodelink(struct us_data *us, u8 *data, u16 len)
cmnd[4] = (u8)(len >> 8);
cmnd[5] = (u8)len;
- retval = rts51x_bulk_transport_special(us, 0, cmnd, 12, data, len, DMA_TO_DEVICE, NULL);
+ retval = rts51x_bulk_transport_special(us, 0, cmnd, 12, buf, len, DMA_TO_DEVICE, NULL);
+ kfree(buf);
if (retval != USB_STOR_TRANSPORT_GOOD) {
return -EIO;
}
--
1.7.9