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| author | Pan Bian <bianpan2016@163.com> | 2019-11-07 09:33:20 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-06 21:48:29 -0800 |
| commit | 99a8efbb6e30b72ac98cecf81103f847abffb1e5 (patch) | |
| tree | ed92ada605c3dbdcb6438597daa1a287c737be5b /drivers/nfc | |
| parent | 648db0514a3808eead513d7abfaf650d02a64d5c (diff) | |
| download | linux-99a8efbb6e30b72ac98cecf81103f847abffb1e5.tar.gz linux-99a8efbb6e30b72ac98cecf81103f847abffb1e5.tar.bz2 linux-99a8efbb6e30b72ac98cecf81103f847abffb1e5.zip | |
NFC: st21nfca: fix double free
The variable nfcid_skb is not changed in the callee nfc_hci_get_param()
if error occurs. Consequently, the freed variable nfcid_skb will be
freed again, resulting in a double free bug. Set nfcid_skb to NULL after
releasing it to fix the bug.
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/st21nfca/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/nfc/st21nfca/core.c b/drivers/nfc/st21nfca/core.c index f9ac176cf257..2ce17932a073 100644 --- a/drivers/nfc/st21nfca/core.c +++ b/drivers/nfc/st21nfca/core.c @@ -708,6 +708,7 @@ static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev, NFC_PROTO_FELICA_MASK; } else { kfree_skb(nfcid_skb); + nfcid_skb = NULL; /* P2P in type A */ r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE, ST21NFCA_RF_READER_F_NFCID1, |