From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Jens Axboe <axboe@kernel.dk>
Subject: [ 14/19] block: avoid using uninitialized value in from queue_var_store
Date: Wed, 10 Apr 2013 15:50:37 -0700 [thread overview]
Message-ID: <20130410225028.288909114@linuxfoundation.org> (raw)
In-Reply-To: <20130410225026.833809117@linuxfoundation.org>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arnd Bergmann <arnd@arndb.de>
commit c678ef5286ddb5cf70384ad5af286b0afc9b73e1 upstream.
As found by gcc-4.8, the QUEUE_SYSFS_BIT_FNS macro creates functions
that use a value generated by queue_var_store independent of whether
that value was set or not.
block/blk-sysfs.c: In function 'queue_store_nonrot':
block/blk-sysfs.c:244:385: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
Unlike most other such warnings, this one is not a false positive,
writing any non-number string into the sysfs files indeed has
an undefined result, rather than returning an error.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
block/blk-sysfs.c | 2 ++
1 file changed, 2 insertions(+)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -200,6 +200,8 @@ queue_store_##name(struct request_queue
unsigned long val; \
ssize_t ret; \
ret = queue_var_store(&val, page, count); \
+ if (ret < 0) \
+ return ret; \
if (neg) \
val = !val; \
\
next prev parent reply other threads:[~2013-04-10 22:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-10 22:50 [ 00/19] 3.0.73-stable review Greg Kroah-Hartman
2013-04-10 22:50 ` [ 01/19] ASoC: dma-sh7760: Fix compile error Greg Kroah-Hartman
2013-04-10 22:50 ` [ 02/19] UBIFS: make space fixup work in the remount case Greg Kroah-Hartman
2013-04-10 22:50 ` [ 03/19] reiserfs: Fix warning and inode leak when deleting inode with xattrs Greg Kroah-Hartman
2013-04-11 7:33 ` Pawel Zawora
2013-04-11 19:04 ` Greg Kroah-Hartman
2013-04-10 22:50 ` [ 04/19] ALSA: hda - bug fix on return value when getting HDMI ELD info Greg Kroah-Hartman
2013-04-10 22:50 ` [ 05/19] ALSA: hda - fix typo in proc output Greg Kroah-Hartman
2013-04-10 22:50 ` [ 06/19] ext4: fixup 64-bit divides in 3.0-stable backport of upstream fix Greg Kroah-Hartman
2013-04-10 22:50 ` [ 07/19] libata: Use integer return value for atapi_command_packet_set Greg Kroah-Hartman
2013-04-10 22:50 ` [ 08/19] libata: Set max sector to 65535 for Slimtype DVD A DS8A8SH drive Greg Kroah-Hartman
2013-04-10 22:50 ` [ 09/19] alpha: Add irongate_io to PCI bus resources Greg Kroah-Hartman
2013-04-10 22:50 ` [ 10/19] ftrace: Consistently restore trace function on sysctl enabling Greg Kroah-Hartman
2013-04-10 22:50 ` [ 11/19] powerpc: pSeries_lpar_hpte_remove fails from Adjunct partition being performed before the ANDCOND test Greg Kroah-Hartman
2013-04-10 22:50 ` [ 12/19] spinlocks and preemption points need to be at least compiler barriers Greg Kroah-Hartman
2013-04-10 22:50 ` [ 13/19] crypto: gcm - fix assumption that assoc has one segment Greg Kroah-Hartman
2013-04-10 22:50 ` Greg Kroah-Hartman [this message]
2013-04-10 22:50 ` [ 15/19] thermal: return an error on failure to register thermal class Greg Kroah-Hartman
2013-04-10 22:50 ` [ 16/19] mm: prevent mmap_cache race in find_vma() Greg Kroah-Hartman
2013-04-10 22:50 ` [ 17/19] x86-32, mm: Rip out x86_32 NUMA remapping code Greg Kroah-Hartman
2013-04-10 22:50 ` [ 18/19] Revert "mwifiex: cancel cmd timer and free curr_cmd in shutdown process Greg Kroah-Hartman
2013-04-10 22:50 ` [ 19/19] rt2x00: rt2x00pci_regbusy_read() - only print register access failure once Greg Kroah-Hartman
2013-04-11 16:29 ` [ 00/19] 3.0.73-stable review Shuah Khan
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