جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: qed: fix double free in qed_cxt_tables_alloc() If one of the later PF or VF CID bitmap allocations fails, qed_cid_map_alloc() jumps to cid_map_fail and frees the previously allocated CID bitmaps before returning an error. qed_cxt_tables_alloc() then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free() again. Fix this by setting each CID bitmap pointer to NULL after bitmap_free() to avoid double free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc3. Runtime reproduction was not attempted because exercising the failing allocation path requires device-specific setup.

• https://git.kernel.org/stable/c/9fe030719bd083b766602692ee96c8c985798e3c
• https://git.kernel.org/stable/c/06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227
• https://git.kernel.org/stable/c/8cf5e4d2ca6b101d163c7423a426fb0aec34f7bb
• https://git.kernel.org/stable/c/3904b993cc17ec5d7c5d3b57dbd0b775dafb9684
• https://git.kernel.org/stable/c/bdf678a273cadbccc347f331ae2e93ff4d14834c
• https://git.kernel.org/stable/c/0e47fc1c9181ae029e0e35a865cbf2adcbae626c
• https://git.kernel.org/stable/c/a04c207f0801abdd23a169b5f902a9845059a65a
• https://git.kernel.org/stable/c/2bccfb8476ca5f3548afbd623dc7a6980d4e77de