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| author | CQ Tang <cq.tang@intel.com> | 2013-03-18 11:02:21 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-03-18 11:32:03 -0700 |
| commit | 66db3feb486c01349f767b98ebb10b0c3d2d021b (patch) | |
| tree | 89c75fe87e8cf1ad288ca32b98b8e6e258eb7493 /arch | |
| parent | a937536b868b8369b98967929045f1df54234323 (diff) | |
| download | linux-66db3feb486c01349f767b98ebb10b0c3d2d021b.tar.gz linux-66db3feb486c01349f767b98ebb10b0c3d2d021b.tar.bz2 linux-66db3feb486c01349f767b98ebb10b0c3d2d021b.zip | |
x86-64: Fix the failure case in copy_user_handle_tail()
The increment of "to" in copy_user_handle_tail() will have incremented
before a failure has been noted. This causes us to skip a byte in the
failure case.
Only do the increment when assured there is no failure.
Signed-off-by: CQ Tang <cq.tang@intel.com>
Link: http://lkml.kernel.org/r/20130318150221.8439.993.stgit@phlsvslse11.ph.intel.com
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/lib/usercopy_64.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c index 05928aae911e..906fea315791 100644 --- a/arch/x86/lib/usercopy_64.c +++ b/arch/x86/lib/usercopy_64.c @@ -74,10 +74,10 @@ copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest) char c; unsigned zero_len; - for (; len; --len) { + for (; len; --len, to++) { if (__get_user_nocheck(c, from++, sizeof(char))) break; - if (__put_user_nocheck(c, to++, sizeof(char))) + if (__put_user_nocheck(c, to, sizeof(char))) break; } |