tree 55542172dd992db5172eb64078ce01cac7db1a7b
parent c46a024ea5eb0165114dbbc8c82c29b7bcf66e71
author Jan Kara <jack@suse.cz> 1433257828 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1433266132 -0700

lib: Fix strnlen_user() to not touch memory after specified maximum

If the specified maximum length of the string is a multiple of unsigned
long, we would load one long behind the specified maximum.  If that
happens to be in a next page, we can hit a page fault although we were
not expected to.

Fix the off-by-one bug in the test whether we are at the end of the
specified range.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>