UPSTREAM: zram: fix possible use after free in zcomp_create()

commit 3aaf14da807a4e9931a37f21e4251abb8a67021b upstream.

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

Bug: 25951511

Change-Id: I9346eb152e2b4fb8e1942e2acd6483d488297f94
Fixes: beca3ec71fe5 ("zram: add multi stream functionality")
Signed-off-by: Luis Henriques <>
Acked-by: Sergey Senozhatsky <>
Acked-by: Minchan Kim <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>
1 file changed