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mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe

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As far as I can tell, strncpy_from_unsafe never returns -EFAULT.  ret is
the result of a __copy_from_user_inatomic(), which is 0 for success and
positive (in this case necessarily 1) for access error - it is never
negative.  So we were always returning the length of the, possibly
truncated, destination string.

Signed-off-by: Rasmus Villemoes <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rasmus Villemoes 2015-11-05 18:50:11 -08:00 • committed by Linus Torvalds
commit 9dd861d55b
1 changed files with 1 additions and 1 deletions
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mm/maccess.c
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@ -104,5 +104,5 @@ long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
pagefault_enable();
set_fs(old_fs);
return ret < 0 ? ret : src - unsafe_addr;
return ret ? -EFAULT : src - unsafe_addr;
}