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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2016-12-14 15:05:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:08 -0800 |
| commit | 9a29d0fbc2d9ad99fb8a981ab72548cc360e9d4c (patch) | |
| tree | 1d5030971bc9ec95e2b388cc239530d9e8695933 | |
| parent | bd4171a5d4c2827f4ae7a235389648d7c149a41b (diff) | |
| download | lwn-9a29d0fbc2d9ad99fb8a981ab72548cc360e9d4c.tar.gz lwn-9a29d0fbc2d9ad99fb8a981ab72548cc360e9d4c.zip | |
relay: check array offset before using it
Smatch complains that we started using the array offset before we
checked that it was valid.
Fixes: 017c59c042d0 ('relay: Use per CPU constructs for the relay channel buffer pointers')
Link: http://lkml.kernel.org/r/20161013084947.GC16198@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/relay.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index da79a109dbeb..8f18d314a96a 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -809,11 +809,11 @@ void relay_subbufs_consumed(struct rchan *chan, { struct rchan_buf *buf; - if (!chan) + if (!chan || cpu >= NR_CPUS) return; buf = *per_cpu_ptr(chan->buf, cpu); - if (cpu >= NR_CPUS || !buf || subbufs_consumed > chan->n_subbufs) + if (!buf || subbufs_consumed > chan->n_subbufs) return; if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed) |