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nfc: nci: assert requested protocol is valid

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The protocol is used in a bit mask to determine if the protocol is
supported. Assert the provided protocol is less than the maximum
defined so it doesn't potentially perform a shift-out-of-bounds and
provide a clearer error for undefined protocols vs unsupported ones.

Fixes: 6a2968aaf5 ("NFC: basic NCI protocol implementation")
Reported-and-tested-by: syzbot+0839b78e119aae1fec78@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0839b78e119aae1fec78
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231009200054.82557-1-jeremy@jcline.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jeremy Cline 2023-10-09 16:00:54 -04:00 committed by Paolo Abeni
parent e2bca4870f
commit 354a6e707e
1 changed files with 5 additions and 0 deletions
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5
net/nfc/nci/core.c
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@ -909,6 +909,11 @@ static int nci_activate_target(struct nfc_dev *nfc_dev,
return -EINVAL;
}
if (protocol >= NFC_PROTO_MAX) {
pr_err("the requested nfc protocol is invalid\n");
return -EINVAL;
}
if (!(nci_target->supported_protocols & (1 << protocol))) {
pr_err("target does not support the requested protocol 0x%x\n",
protocol);