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| author | Lv Yunlong <lyl2019@mail.ustc.edu.cn> | 2021-04-27 09:22:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-04-27 15:36:10 -0700 |
| commit | 75258586793efc521e5dd52a5bf6c7a4cf7002be (patch) | |
| tree | 7096aad353da99399c4f9d554dc6aa5114c5ac1d | |
| parent | 0711459095bc9ddb5a0086146d2751e6d5412cbf (diff) | |
| download | linux-75258586793efc521e5dd52a5bf6c7a4cf7002be.tar.gz linux-75258586793efc521e5dd52a5bf6c7a4cf7002be.tar.bz2 linux-75258586793efc521e5dd52a5bf6c7a4cf7002be.zip | |
net:nfc:digital: Fix a double free in digital_tg_recv_dep_req
In digital_tg_recv_dep_req, it calls nfc_tm_data_received(..,resp).
If nfc_tm_data_received() failed, the callee will free the resp via
kfree_skb() and return error. But in the exit branch, the resp
will be freed again.
My patch sets resp to NULL if nfc_tm_data_received() failed, to
avoid the double free.
Fixes: 1c7a4c24fbfd9 ("NFC Digital: Add target NFC-DEP support")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/nfc/digital_dep.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c index 1150731126e2..3982fa084737 100644 --- a/net/nfc/digital_dep.c +++ b/net/nfc/digital_dep.c @@ -1273,6 +1273,8 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, } rc = nfc_tm_data_received(ddev->nfc_dev, resp); + if (rc) + resp = NULL; exit: kfree_skb(ddev->chaining_skb); |