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| author | Kees Cook <keescook@chromium.org> | 2021-08-18 07:39:12 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2021-08-19 17:51:53 +0300 |
| commit | a31e5a4158d03595ca4258b94397d4097be0ebe4 (patch) | |
| tree | 3f1eec94e13eb8345d9a2533c86420ad2f1dacf5 /net | |
| parent | ecb71f2566673553bc067e5b0036756871d0b9d3 (diff) | |
| download | linux-a31e5a4158d03595ca4258b94397d4097be0ebe4.tar.xz | |
Bluetooth: mgmt: Pessimize compile-time bounds-check
After gaining __alloc_size hints, GCC thinks it can reach a memcpy()
with eir_len == 0 (since it can't see into the rewrite of status).
Instead, check eir_len == 0, avoiding this future warning:
In function 'eir_append_data',
inlined from 'read_local_oob_ext_data_complete' at net/bluetooth/mgmt.c:7210:12:
./include/linux/fortify-string.h:54:29: warning: '__builtin_memcpy' offset 5 is out of the bounds [0, 3] [-Warray-bounds]
...
net/bluetooth/hci_request.h:133:2: note: in expansion of macro 'memcpy'
133 | memcpy(&eir[eir_len], data, data_len);
| ^~~~~~
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-bluetooth@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bluetooth/mgmt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 1e21e014efd2..cea01e275f1e 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -7204,7 +7204,7 @@ static void read_local_oob_ext_data_complete(struct hci_dev *hdev, u8 status, if (!mgmt_rp) goto done; - if (status) + if (eir_len == 0) goto send_rsp; eir_len = eir_append_data(mgmt_rp->eir, 0, EIR_CLASS_OF_DEV, |