Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix a use after free in siw_alloc_mr Our code analyzer reported a UAF. In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the err_out branch of siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr). My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {} section, to avoid the uaf.
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
2251334dcac9eb337575d8767e2a6a7e81848f7f to < 30b9e92d0b5e5d5dc1101ab856c17009537cbca4affected2251334dcac9eb337575d8767e2a6a7e81848f7f to < 608a4b90ece039940e9425ee2b39c8beff27e00caffected2251334dcac9eb337575d8767e2a6a7e81848f7f to < 3e22b88e02c194f6c80867abfef5cc09383461f4affected2251334dcac9eb337575d8767e2a6a7e81848f7f to < ad9ce7188432650469a6c7625bf479f5ed0b6155affected2251334dcac9eb337575d8767e2a6a7e81848f7f to < 3093ee182f01689b89e9f8797b321603e5de4f63affected
Linux Linux
Default version status: affected
5.3affected0 to < 5.3unaffected5.4.119 to ≤ 5.4.*unaffected5.10.37 to ≤ 5.10.*unaffected5.11.21 to ≤ 5.11.*unaffected5.12.4 to ≤ 5.12.*unaffected5.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 ↗
- https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c ↗
- https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 ↗
- https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 ↗
- https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 ↗