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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-08-18 21:16:49 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:09:39 +0200 |
| commit | 4777b47e7b19a71fec1daa92bafa0857d7404e14 (patch) | |
| tree | d7808cc2f18efdd21060163b3e0f341e2630ff61 /arch/hexagon | |
| parent | c0fd2000f763cded915a196a78668db9991a124c (diff) | |
| download | lwn-4777b47e7b19a71fec1daa92bafa0857d7404e14.tar.gz lwn-4777b47e7b19a71fec1daa92bafa0857d7404e14.zip | |
hexagon: fix strncpy_from_user() error return
commit f35c1e0671728d1c9abc405d05ef548b5fcb2fc4 upstream.
It's -EFAULT, not -1 (and contrary to the comment in there,
__strnlen_user() can return 0 - on faults).
Acked-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/hexagon')
| -rw-r--r-- | arch/hexagon/include/asm/uaccess.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/hexagon/include/asm/uaccess.h b/arch/hexagon/include/asm/uaccess.h index f000a382bc7f..f61cfb28e9f2 100644 --- a/arch/hexagon/include/asm/uaccess.h +++ b/arch/hexagon/include/asm/uaccess.h @@ -103,7 +103,8 @@ static inline long hexagon_strncpy_from_user(char *dst, const char __user *src, { long res = __strnlen_user(src, n); - /* return from strnlen can't be zero -- that would be rubbish. */ + if (unlikely(!res)) + return -EFAULT; if (res > n) { copy_from_user(dst, src, n); |