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| author | Jeremy Cline <jeremy@jcline.org> | 2023-10-09 23:00:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-25 12:54:14 +0300 |
| commit | a424807d860ba816aaafc3064b46b456361c0802 (patch) | |
| tree | e5b9d7f24972e25b1fea24380e9cc2cce57dec74 | |
| parent | b5b03da30bd5bf260dcad83c5dece5fad70895f4 (diff) | |
| download | linux-a424807d860ba816aaafc3064b46b456361c0802.tar.xz | |
nfc: nci: assert requested protocol is valid
[ Upstream commit 354a6e707e29cb0c007176ee5b8db8be7bd2dee0 ]
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>
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/nfc/nci/core.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c index ed9019d807c7..4c931bd1c174 100644 --- a/net/nfc/nci/core.c +++ b/net/nfc/nci/core.c @@ -894,6 +894,11 @@ 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); |