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| author | Jens Axboe <axboe@kernel.dk> | 2017-11-19 11:52:55 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-20 08:15:31 +0200 |
| commit | 0f62edba7ca63ba8abd05379b812723162313608 (patch) | |
| tree | 20f85927ada0a990b68774b503263f1aa6061207 /kernel | |
| parent | 0ef5b092bb9936584a8885201f9e712ceec4a9d2 (diff) | |
| download | linux-0f62edba7ca63ba8abd05379b812723162313608.tar.gz linux-0f62edba7ca63ba8abd05379b812723162313608.tar.bz2 linux-0f62edba7ca63ba8abd05379b812723162313608.zip | |
blktrace: fix trace mutex deadlock
commit 2967acbb257a6a9bf912f4778b727e00972eac9b upstream.
A previous commit changed the locking around registration/cleanup,
but direct callers of blk_trace_remove() were missed. This means
that if we hit the error path in setup, we will deadlock on
attempting to re-acquire the queue trace mutex.
Fixes: 1f2cac107c59 ("blktrace: fix unlocked access to init/start-stop/teardown")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/blktrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 55337d797deb..a88e677c74f3 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -572,7 +572,7 @@ static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, return ret; if (copy_to_user(arg, &buts, sizeof(buts))) { - blk_trace_remove(q); + __blk_trace_remove(q); return -EFAULT; } return 0; @@ -618,7 +618,7 @@ static int compat_blk_trace_setup(struct request_queue *q, char *name, return ret; if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { - blk_trace_remove(q); + __blk_trace_remove(q); return -EFAULT; } |