Commit a1be1f39 authored Feb 06, 2018 by Eric Biggers Committed by Linus Torvalds Feb 06, 2018

kernel/relay.c: revert "kernel/relay.c: fix potential memory leak"

This reverts commit ba62bafe ("kernel/relay.c: fix potential memory leak").

This commit introduced a double free bug, because 'chan' is already
freed by the line:

    kref_put(&chan->kref, relay_destroy_channel);

This bug was found by syzkaller, using the BLKTRACESETUP ioctl.

Link: http://lkml.kernel.org/r/20180127004759.101823-1-ebiggers3@gmail.com


Fixes: ba62bafe ("kernel/relay.c: fix potential memory leak")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@vger.kernel.org>	[4.7+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 28f3a488

kernel/relay.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -611,7 +611,6 @@ free_bufs:

		kref_put(&chan->kref, relay_destroy_channel);
		mutex_unlock(&relay_channels_mutex);
		kfree(chan);
		return NULL;
		}
		EXPORT_SYMBOL_GPL(relay_open);

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