mm/mempolicy.c: fix out of bounds write in mpol_parse_str()

What we are trying to do is change the '=' character to a NUL terminator
and then at the end of the function we restore it back to an '='.  The
problem is there are two error paths where we jump to the end of the
function before we have replaced the '=' with NUL.

We end up putting the '=' in the wrong place (possibly one element
before the start of the buffer).

Link: http://lkml.kernel.org/r/[email protected]
Reported-by: [email protected]
Fixes: 095f1fc4ebf3 ("mempolicy: rework shmem mpol parsing and display")
Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Dmitry Vyukov <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions