This is a note to let you know that I've just added the patch titled
media: dib7000p: Fix potential division by zero
to the 5.10-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-dib7000p-fix-potential-division-by-zero.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d77c9a80ab0cb4886ef97b51d1de07f95ac0fca7
Author: Daniil Dulov <d.dulov@xxxxxxxxxx>
Date: Fri Mar 24 06:38:32 2023 -0700
media: dib7000p: Fix potential division by zero
[ Upstream commit a1db7b2c5533fc67e2681eb5efc921a67bc7d5b8 ]
Variable loopdiv can be assigned 0, then it is used as a denominator,
without checking it for 0.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 713d54a8bd81 ("[media] DiB7090: add support for the dib7090 based")
Signed-off-by: Daniil Dulov <d.dulov@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
[hverkuil: (bw != NULL) -> bw]
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/dvb-frontends/dib7000p.c b/drivers/media/dvb-frontends/dib7000p.c
index 55bee50aa8716..1f0b0690198ef 100644
--- a/drivers/media/dvb-frontends/dib7000p.c
+++ b/drivers/media/dvb-frontends/dib7000p.c
@@ -497,7 +497,7 @@ static int dib7000p_update_pll(struct dvb_frontend *fe, struct dibx000_bandwidth
prediv = reg_1856 & 0x3f;
loopdiv = (reg_1856 >> 6) & 0x3f;
- if ((bw != NULL) && (bw->pll_prediv != prediv || bw->pll_ratio != loopdiv)) {
+ if (loopdiv && bw && (bw->pll_prediv != prediv || bw->pll_ratio != loopdiv)) {
dprintk("Updating pll (prediv: old = %d new = %d ; loopdiv : old = %d new = %d)\n", prediv, bw->pll_prediv, loopdiv, bw->pll_ratio);
reg_1856 &= 0xf000;
reg_1857 = dib7000p_read_word(state, 1857);
