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authorDan Carpenter <dan.carpenter@oracle.com>2016-12-14 15:05:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-14 16:04:08 -0800
commit9a29d0fbc2d9ad99fb8a981ab72548cc360e9d4c (patch)
tree1d5030971bc9ec95e2b388cc239530d9e8695933 /kernel/relay.c
parentbd4171a5d4c2827f4ae7a235389648d7c149a41b (diff)
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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>
Diffstat (limited to 'kernel/relay.c')
-rw-r--r--kernel/relay.c4
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)