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[media] media: mem2mem: eliminate possible NULL pointer dereference 

This patch removes the possible NULL pointer dereference in mem2mem
code.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andrzej Pietrasiewicz 2011-08-25 07:21:21 -03:00 committed by Mauro Carvalho Chehab
parent 1d0c86cad3
commit a6bd62be5a
1 changed files with 10 additions and 8 deletions
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18
drivers/media/video/v4l2-mem2mem.c
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@ -97,11 +97,12 @@ void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
if (list_empty(&q_ctx->rdy_queue))
goto end;
if (list_empty(&q_ctx->rdy_queue)) {
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return NULL;
}
b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, list);
end:
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return &b->vb;
}
@ -117,12 +118,13 @@ void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
if (!list_empty(&q_ctx->rdy_queue)) {
b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer,
list);
list_del(&b->list);
q_ctx->num_rdy--;
if (list_empty(&q_ctx->rdy_queue)) {
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return NULL;
}
b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, list);
list_del(&b->list);
q_ctx->num_rdy--;
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return &b->vb;