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 <redacted>
---
 include/net/bluetooth/mgmt.h | 2 +-
 net/bluetooth/mgmt.c         | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 74edea06985b..4b07ce6dfd69 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h

@@ -780,7 +780,7 @@ struct mgmt_adv_pattern {
        __u8 ad_type;
        __u8 offset;
        __u8 length;
-       __u8 value[31];
+       __u8 value[HCI_MAX_AD_LENGTH];

 } __packed;

 #define MGMT_OP_ADD_ADV_PATTERNS_MONITOR       0x0052

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index a3d16eece0d2..500033b70a96 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c

@@ -5391,9 +5391,9 @@ 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);
--

2.39.5