[PW_SID:1108156] Bluetooth: hci: validate codec capability element length#293
[PW_SID:1108156] Bluetooth: hci: validate codec capability element length#293BluezTestBot wants to merge 1 commit into
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Read Local Codec Capabilities returns a sequence of capability elements. Each element starts with a one-byte length followed by that many payload bytes. hci_read_codec_capabilities() checks that the skb contains the length byte, but then validates only caps->len against the remaining skb length. A malformed controller response with one remaining byte and caps->len set to one passes that check even though the element needs two bytes. The parser then records a two-byte capability and copies one byte beyond the advertised response payload into the codec list. Validate the full element size, including the length byte, before adding it to the accumulated capability length. This preserves all well-formed capability elements and drops only truncated controller responses. Assisted-by: Codex:gpt-5.5-cyber-preview Signed-off-by: Samuel Moelius <sam.moelius@trailofbits.com>
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Read Local Codec Capabilities returns a sequence of capability elements.
Each element starts with a one-byte length followed by that many payload
bytes.
hci_read_codec_capabilities() checks that the skb contains the length
byte, but then validates only caps->len against the remaining skb
length. A malformed controller response with one remaining byte and
caps->len set to one passes that check even though the element needs two
bytes. The parser then records a two-byte capability and copies one
byte beyond the advertised response payload into the codec list.
Validate the full element size, including the length byte, before adding
it to the accumulated capability length. This preserves all well-formed
capability elements and drops only truncated controller responses.
Assisted-by: Codex:gpt-5.5-cyber-preview
Signed-off-by: Samuel Moelius sam.moelius@trailofbits.com
net/bluetooth/hci_codec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)