diff options
| author | Ilia Gavrilov <Ilia.Gavrilov@infotecs.ru> | 2025-10-20 15:12:55 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-07 06:12:30 +0900 |
| commit | 96616530f524a0a76248cd44201de0a9e8526190 (patch) | |
| tree | 2ed637304a9f3f142164d6ae33fc1a24997cde06 /net/bluetooth | |
| parent | 1f4223644a4d9bd76afc7a41c6d0cdbcdcd84a27 (diff) | |
Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern()
commit 8d59fba49362c65332395789fd82771f1028d87e upstream.
In the parse_adv_monitor_pattern() function, the value of
the 'length' variable is currently limited to HCI_MAX_EXT_AD_LENGTH(251).
The size of the 'value' array in the mgmt_adv_pattern structure is 31.
If the value of 'pattern[i].length' is set in the user space
and exceeds 31, the 'patterns[i].value' array can be accessed
out of bound when copied.
Increasing the size of the 'value' array in
the 'mgmt_adv_pattern' structure will break the userspace.
Considering this, and to avoid OOB access revert the limits for 'offset'
and 'length' back to the value of HCI_MAX_AD_LENGTH.
Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.
Fixes: db08722fc7d4 ("Bluetooth: hci_core: Fix missing instances using HCI_MAX_AD_LENGTH")
Cc: stable@vger.kernel.org
Signed-off-by: Ilia Gavrilov <Ilia.Gavrilov@infotecs.ru>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/mgmt.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index a11d25c389f8..9bd4d5bc84db 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -5436,9 +5436,9 @@ static u8 parse_adv_monitor_pattern(struct adv_monitor *m, u8 pattern_count, for (i = 0; i < pattern_count; i++) { offset = patterns[i].offset; length = patterns[i].length; - if (offset >= HCI_MAX_EXT_AD_LENGTH || - length > HCI_MAX_EXT_AD_LENGTH || - (offset + length) > HCI_MAX_EXT_AD_LENGTH) + if (offset >= HCI_MAX_AD_LENGTH || + length > HCI_MAX_AD_LENGTH || + (offset + length) > HCI_MAX_AD_LENGTH) return MGMT_STATUS_INVALID_PARAMS; p = kmalloc(sizeof(*p), GFP_KERNEL); |