Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix null-deref in agg_dequeue To prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c) when cl->qdisc->ops->peek(cl->qdisc) returns NULL, we check the return value before using it, similar to the existing approach in sch_hfsc.c. To avoid code duplication, the following changes are made: 1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static inline function. 2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to include/net/pkt_sched.h so that sch_qfq can reuse it. 3. Applied qdisc_peek_len in agg_dequeue to avoid crashing.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
462dbc9101acd38e92eda93c0726857517a24bbd to < 71d84658a61322e5630c85c5388fc25e4a2d08b2affected462dbc9101acd38e92eda93c0726857517a24bbd to < 99fc137f178797204d36ac860dd8b31e35baa2dfaffected462dbc9101acd38e92eda93c0726857517a24bbd to < 1bed56f089f09b465420bf23bb32985c305cfc28affected462dbc9101acd38e92eda93c0726857517a24bbd to < 3c2a8994807623c7655ece205667ae2cf74940aaaffected462dbc9101acd38e92eda93c0726857517a24bbd to < 6ffa9d66187188e3068b5a3895e6ae1ee34f9199affected462dbc9101acd38e92eda93c0726857517a24bbd to < 6ff8e74c8f8a68ec07ef837b95425dfe900d060faffected462dbc9101acd38e92eda93c0726857517a24bbd to < dd831ac8221e691e9e918585b1003c7071df0379affected
Linux Linux
Default version status: affected
3.8affected0 to < 3.8unaffected5.4.302 to ≤ 5.4.*unaffected5.10.247 to ≤ 5.10.*unaffected5.15.197 to ≤ 5.15.*unaffected6.1.159 to ≤ 6.1.*unaffected6.6.116 to ≤ 6.6.*unaffected6.12.57 to ≤ 6.12.*unaffected6.16 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2 ↗
- https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df ↗
- https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28 ↗
- https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa ↗
- https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199 ↗
- https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f ↗
- https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379 ↗