Patch "media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt" has been added to the 4.4-stable tree

Patch "media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-c8sectpfe-fix-potential-null-pointer-dereference-in-c8sectpfe_timer_interrupt.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:57:32 CET 2018
From: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
Date: Mon, 20 Nov 2017 09:00:55 -0500
Subject: media: c8sectpfe: fix potential NULL pointer dereference in c8sectpfe_timer_interrupt

From: "Gustavo A. R. Silva" <garsilva@embeddedor.com>


[ 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>
---
 drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 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(un
 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(unsig
 	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));
 


Patches currently in stable-queue which might be from garsilva@embeddedor.com are

queue-4.4/media-c8sectpfe-fix-potential-null-pointer-dereference-in-c8sectpfe_timer_interrupt.patch