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media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt

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_channel_ is being dereferenced before it is null checked, hence there is a
potential null pointer dereference. Fix this by moving the pointer dereference
after _channel_ has been null checked.

This issue was detected with the help of Coccinelle.

Fixes: c5f5d0f997 ("[media] c8sectpfe: STiH407/10 Linux DVB demux support")

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Gustavo A. R. Silva 2017-11-20 09:00:55 -05:00 committed by Mauro Carvalho Chehab
parent 32f2fe5944
commit baed3c4bc4
1 changed files with 3 additions and 1 deletions
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4
drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c
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@ -83,7 +83,7 @@ static void c8sectpfe_timer_interrupt(struct timer_list *t)
static void channel_swdemux_tsklet(unsigned long data)
{
struct channel_info *channel = (struct channel_info *)data;
struct c8sectpfei *fei = channel->fei;
struct c8sectpfei *fei;
unsigned long wp, rp;
int pos, num_packets, n, size;
u8 *buf;
@ -91,6 +91,8 @@ static void channel_swdemux_tsklet(unsigned long data)
if (unlikely(!channel || !channel->irec))
return;
fei = channel->fei;
wp = readl(channel->irec + DMA_PRDS_BUSWP_TP(0));
rp = readl(channel->irec + DMA_PRDS_BUSRP_TP(0));