| Message ID | 20231009200054.82557-1-jeremy@jcline.org (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 354a6e707e29cb0c007176ee5b8db8be7bd2dee0 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v2,net] nfc: nci: assert requested protocol is valid | expand |
On Mon, Oct 09, 2023 at 04:00:54PM -0400, Jeremy Cline wrote: > 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: 6a2968aaf50c ("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> As per my review of v1, this looks good to me. Reviewed-by: Simon Horman <horms@kernel.org>
Hello: This patch was applied to netdev/net.git (main) by Paolo Abeni <pabeni@redhat.com>: On Mon, 9 Oct 2023 16:00:54 -0400 you wrote: > 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: 6a2968aaf50c ("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> > > [...] Here is the summary with links: - [v2,net] nfc: nci: assert requested protocol is valid https://git.kernel.org/netdev/net/c/354a6e707e29 You are awesome, thank you!
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c index fff755dde30d..6c9592d05120 100644 --- a/net/nfc/nci/core.c +++ b/net/nfc/nci/core.c @@ -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);
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: 6a2968aaf50c ("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> --- Changes from v1: - Target the correct tree (net) net/nfc/nci/core.c | 5 +++++ 1 file changed, 5 insertions(+)