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kernel/relay.c: revert "kernel/relay.c: fix potential memory leak"
This reverts commitba62bafe94
("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:ba62bafe94
("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>
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a1be1f3931
@ -611,7 +611,6 @@ free_bufs:
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kref_put(&chan->kref, relay_destroy_channel);
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mutex_unlock(&relay_channels_mutex);
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kfree(chan);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(relay_open);
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