diff options
| author | Dan Carpenter <dan.carpenter@linaro.org> | 2024-07-24 11:08:18 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-07-25 08:05:05 -0700 |
| commit | 61ab751451f5ebd0b98e02276a44e23a10110402 (patch) | |
| tree | b9a123ca8b49d7a780eb8ea0b95c77ecf9156681 | |
| parent | 36e3b949e35964e22b9a57f960660fc599038dd4 (diff) | |
mISDN: Fix a use after free in hfcmulti_tx()
Don't dereference *sp after calling dev_kfree_skb(*sp).
Fixes: af69fb3a8ffa ("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>
| -rw-r--r-- | drivers/isdn/hardware/mISDN/hfcmulti.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c index 0d2928d8aeae..e5a483fd9ad8 100644 --- a/drivers/isdn/hardware/mISDN/hfcmulti.c +++ b/drivers/isdn/hardware/mISDN/hfcmulti.c @@ -1901,7 +1901,7 @@ 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; @@ -2122,14 +2122,15 @@ 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; } |