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nfc/nci: Add the inconsistency check between the input data length and count

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[ Upstream commit 068648aab7 ]

write$nci(r0, &(0x7f0000000740)=ANY=[@ANYBLOB="610501"], 0xf)

Syzbot constructed a write() call with a data length of 3 bytes but a count value
of 15, which passed too little data to meet the basic requirements of the function
nci_rf_intf_activated_ntf_packet().

Therefore, increasing the comparison between data length and count value to avoid
problems caused by inconsistent data length and count.

Reported-and-tested-by: syzbot+71bfed2b2bcea46c98f2@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Edward Adam Davis
2024-05-28 11:12:31 +08:00
committed by Greg Kroah-Hartman
parent 833112b7f1
commit 41f5e2840c
1 changed files with 4 additions and 0 deletions
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4
drivers/nfc/virtual_ncidev.c
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@ -121,6 +121,10 @@ static ssize_t virtual_ncidev_write(struct file *file,
kfree_skb(skb); kfree_skb(skb);
return -EFAULT; return -EFAULT;
} }
if (strnlen(skb->data, count) != count) {
kfree_skb(skb);
return -EINVAL;
}
nci_recv_frame(ndev, skb); nci_recv_frame(ndev, skb);
return count; return count;