zram: fix possible use after free in zcomp_create()
authorLuis Henriques <luis.henriques@canonical.com>
Thu, 17 Sep 2015 23:01:40 +0000 (16:01 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 18 Sep 2015 04:16:07 +0000 (21:16 -0700)
commit3aaf14da807a4e9931a37f21e4251abb8a67021b
treec51131105c74598a587d4bfddc7b4b4d2df5bbb4
parent72714841b705a5b9bccf37ee85a62352bee3a3ef
zram: fix possible use after free in zcomp_create()

zcomp_create() verifies the success of zcomp_strm_{multi,single}_create()
through comp->stream, which can potentially be pointing to memory that
was freed if these functions returned an error.

While at it, replace a 'ERR_PTR(-ENOMEM)' by a more generic
'ERR_PTR(error)' as in the future zcomp_strm_{multi,siggle}_create()
could return other error codes.  Function documentation updated
accordingly.

Fixes: beca3ec71fe5 ("zram: add multi stream functionality")
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/block/zram/zcomp.c