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mISDN: Fix a use after free in hfcmulti_tx() 

ANBZ: #11143

commit 9460ac3dd1ae033bc2b021a458fb535a0c36ddb2 stable.

commit 61ab751451 upstream.

Don't dereference *sp after calling dev_kfree_skb(*sp).

Fixes: af69fb3a8f ("Add mISDN HFC multiport driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/8be65f5a-c2dd-4ba0-8a10-bfe5980b8cfb@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Fixes: CVE-2024-42280
Signed-off-by: Xiao Long <xiaolong@openanolis.org>
Signed-off-by: Qinyun Tan <qinyuntan@linux.alibaba.com>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3958
This commit is contained in:
Dan Carpenter 2024-07-25 00:08:18 +08:00 committed by 小龙
parent 754269838a
commit b57ac0a9bc
1 changed files with 4 additions and 3 deletions
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7
drivers/isdn/hardware/mISDN/hfcmulti.c
View File

@ -1931,7 +1931,7 @@ hfcmulti_dtmf(struct hfc_multi *hc)
static void
hfcmulti_tx(struct hfc_multi *hc, int ch)
{
int i, ii, temp, len = 0;
int i, ii, temp, tmp_len, len = 0;
int Zspace, z1, z2; /* must be int for calculation */
int Fspace, f1, f2;
u_char *d;
@ -2152,14 +2152,15 @@ next_frame:
HFC_wait_nodebug(hc);
}
tmp_len = (*sp)->len;
dev_kfree_skb(*sp);
/* check for next frame */
if (bch && get_next_bframe(bch)) {
len = (*sp)->len;
len = tmp_len;
goto next_frame;
}
if (dch && get_next_dframe(dch)) {
len = (*sp)->len;
len = tmp_len;
goto next_frame;
}