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relay: check array offset before using it

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Smatch complains that we started using the array offset before we
checked that it was valid.

Fixes: 017c59c042 ('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>
This commit is contained in:
Dan Carpenter
2016-12-14 15:05:38 -08:00
committed by Linus Torvalds
parent bd4171a5d4
commit 9a29d0fbc2
1 changed files with 2 additions and 2 deletions
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4
kernel/relay.c
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@@ -809,11 +809,11 @@ void relay_subbufs_consumed(struct rchan *chan,
{ {
struct rchan_buf *buf; struct rchan_buf *buf;
if (!chan) if (!chan || cpu >= NR_CPUS)
return; return;
buf = *per_cpu_ptr(chan->buf, cpu); 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; return;
if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed) if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed)