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nfc/nci: Add the inconsistency check between the input data length and count
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>
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@ -125,6 +125,10 @@ static ssize_t virtual_ncidev_write(struct file *file,
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kfree_skb(skb);
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kfree_skb(skb);
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return -EFAULT;
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return -EFAULT;
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}
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}
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if (strnlen(skb->data, count) != count) {
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kfree_skb(skb);
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return -EINVAL;
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}
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nci_recv_frame(vdev->ndev, skb);
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nci_recv_frame(vdev->ndev, skb);
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return count;
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return count;
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