From: Junlin Li make24@iscas.ac.cn
stable inclusion from stable-v5.10.227 commit 6ae3b9aee42616ee93c4585174f40c767828006d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYPJY CVE: CVE-2024-47698
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 8ae06f360cfaca2b88b98ca89144548b3186aab1 ]
Ensure index in rtl2832_pid_filter does not exceed 31 to prevent out-of-bounds access.
dev->filters is a 32-bit value, so set_bit and clear_bit functions should only operate on indices from 0 to 31. If index is 32, it will attempt to access a non-existent 33rd bit, leading to out-of-bounds access. Change the boundary check from index > 32 to index >= 32 to resolve this issue.
Signed-off-by: Junlin Li make24@iscas.ac.cn Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Fixes: 4b01e01a81b6 ("[media] rtl2832: implement PID filter") [hverkuil: added fixes tag, rtl2830_pid_filter -> rtl2832_pid_filter in logmsg] Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yi Yang yiyang13@huawei.com --- drivers/media/dvb-frontends/rtl2832.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index e5bffaaeed38..1c3e572cad3f 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -982,7 +982,7 @@ static int rtl2832_pid_filter(struct dvb_frontend *fe, u8 index, u16 pid, index, pid, onoff, dev->slave_ts);
/* skip invalid PIDs (0x2000) */ - if (pid > 0x1fff || index > 32) + if (pid > 0x1fff || index >= 32) return 0;
if (onoff)