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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-08-21 23:39:47 -0400 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2016-10-05 22:40:20 -0400 |
| commit | 8bd2ef709d42a7c839c4ebf7c91f4dec2c90b6f6 (patch) | |
| tree | e1c953471dfad2bc0953c3e4374c879faa43087d | |
| parent | 94000fc8f4ab34b031caecdfcc767f478900a7bb (diff) | |
| download | lwn-8bd2ef709d42a7c839c4ebf7c91f4dec2c90b6f6.tar.gz lwn-8bd2ef709d42a7c839c4ebf7c91f4dec2c90b6f6.zip | |
sh: fix copy_from_user()
[ Upstream commit 6e050503a150b2126620c1a1e9b3a368fcd51eac ]
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
| -rw-r--r-- | arch/sh/include/asm/uaccess.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h index 9486376605f4..c04cc18ae9cd 100644 --- a/arch/sh/include/asm/uaccess.h +++ b/arch/sh/include/asm/uaccess.h @@ -151,7 +151,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n) __kernel_size_t __copy_size = (__kernel_size_t) n; if (__copy_size && __access_ok(__copy_from, __copy_size)) - return __copy_user(to, from, __copy_size); + __copy_size = __copy_user(to, from, __copy_size); + + if (unlikely(__copy_size)) + memset(to + (n - __copy_size), 0, __copy_size); return __copy_size; } |