From: Hui Peng <noreply@github.com>
To: linux-bluetooth@vger.kernel.org
Subject: [bluez/bluez] b904ef: sdp: Prevent integer underflow in string attribute...
Date: Wed, 07 Oct 2026 16:26:34 -0700 [thread overview]
Message-ID: <bluez/bluez/push/refs/heads/1181104/000000-b904ef@github.com> (raw)
Branch: refs/heads/1181104
Home: https://github.com/bluez/bluez
Commit: b904efdd05008b502133355b76cfc737edf80b9d
https://github.com/bluez/bluez/commit/b904efdd05008b502133355b76cfc737edf80b9d
Author: Hui Peng <benquike@gmail.com>
Date: 2026-10-07 (Wed, 07 Oct 2026)
Changed paths:
M lib/bluetooth/sdp.c
Log Message:
-----------
sdp: Prevent integer underflow in string attribute length calculation
In lib/bluetooth/sdp.c, attribute string length calculations subtract
sizeof(uint8_t) from d->unitSize (e.g. d->unitSize - sizeof(uint8_t)).
When d->unitSize is 0 or less than sizeof(uint8_t), this subtraction
underflows in 32-bit integer arithmetic to a negative/huge length value,
passing invalid sizes to memory allocation and length extraction
functions.
Add explicit lower-bound guards to ensure that when
d->unitSize <= sizeof(uint8_t), the calculated string length is safely
set to 0.
Assisted-by: Antigravity
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