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| author | Eric Biggers <ebiggers@google.com> | 2018-02-06 15:40:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-06 18:32:46 -0800 |
| commit | a1be1f3931bfe0a42b46fef77a04593c2b136e7f (patch) | |
| tree | baff9a1d4276404cd0ce63aff26846d328f4f8c1 /kernel/relay.c | |
| parent | 28f3a488ed83ac4a01406490941a6486806d1333 (diff) | |
| download | lwn-a1be1f3931bfe0a42b46fef77a04593c2b136e7f.tar.gz lwn-a1be1f3931bfe0a42b46fef77a04593c2b136e7f.zip | |
kernel/relay.c: revert "kernel/relay.c: fix potential memory leak"
This reverts commit ba62bafe942b ("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: ba62bafe942b ("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>
Diffstat (limited to 'kernel/relay.c')
| -rw-r--r-- | kernel/relay.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index 41280033a4c5..f7f40a6e6352 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -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); |