diff options
| author | Gustavo A. R. Silva <garsilva@embeddedor.com> | 2017-11-20 09:00:55 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-24 11:00:22 +0100 |
| commit | bac8b847be924575031d0486b2c53ccad7c910b8 (patch) | |
| tree | a6404084ac7d47aa075e533b6aea8ef602df953c | |
| parent | dadb6c1a8d889b5cab5ff6ed44db9cdb445467e7 (diff) | |
media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt
[ Upstream commit baed3c4bc4c13de93e0dba0a26d601411ebcb389 ]
_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: c5f5d0f99794 ("[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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c b/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c index 30c148b9d65e..06e2cfd09855 100644 --- a/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c +++ b/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c @@ -83,7 +83,7 @@ static void c8sectpfe_timer_interrupt(unsigned long ac8sectpfei) 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)); |