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mISDN: Fix a use after free in hfcmulti_tx()

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[ Upstream commit 61ab751451f5ebd0b98e02276a44e23a10110402 ]

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

Fixes: af69fb3a8f ("Add mISDN HFC multiport driver")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Dan Carpenter 2024-07-24 11:08:18 -05:00 • committed by Greg Kroah-Hartman
commit d3e4d4a98c
1 changed files with 4 additions and 3 deletions
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7
drivers/isdn/hardware/mISDN/hfcmulti.c
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@ -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;
}