جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: qede: Fix NULL pointer dereference in TPA fragment processing Under memory pressure, the qede driver encounters NULL pointer dereferences when processing TPA continuation fragments. Commit 8a8633978b84 ("qede: Add build_skb() support.") accidentally dropped the assignment of tpa_info->buffer.data in qede_tpa_start(). When memory pressure causes an SKB allocation failure in qede_tpa_start(), the driver sets tpa_start_fail = true and attempts to recycle the physical page later in qede_tpa_end() via qede_reuse_page(). However, because buffer.data was left uninitialized (NULL), qede_reuse_page() pushes a "ghost" BD (valid DMA mapping but NULL data pointer) back into the active Rx ring. The next time the hardware uses this ring slot, it passes a NULL page to qede_fill_frag_skb(), causing a kernel panic. Example crash from production system: BUG: unable to handle kernel NULL pointer dereference at 0x8 RIP: qede_fill_frag_skb+0x96/0x430 [qede] Call Trace: qede_rx_int+0xb06/0x1de0 qede_poll+0x2f4/0x6c0 __napi_poll+0x2d/0x130 Fix the root cause by restoring the tpa_info->buffer.data assignment in qede_tpa_start(), ensuring valid pages are correctly tracked and recycled. Additionally, update the stale comment for struct qede_agg_info::buffer to reflect its current usage.

• https://git.kernel.org/stable/c/e2214e2793154b745436e46c6a9a7985d9b3781d
• https://git.kernel.org/stable/c/dd8bc0a9d87d2b048711edd17ba7286432edd285
• https://git.kernel.org/stable/c/fa7c9bd2c4a8de167e2fb32968ca4d91dd774375
• https://git.kernel.org/stable/c/a5e1fdc126ab337d601d1a00cc4b47910679d005
• https://git.kernel.org/stable/c/7f911e208b3ca2c76d9f2bbba1f54b9403568c10
• https://git.kernel.org/stable/c/2a952fb1b20d83e83ca852773e6188511f7d2191
• https://git.kernel.org/stable/c/f5c8619ccbd70102642120c4c6fda1c048a555fd
• https://git.kernel.org/stable/c/06aa3d26327f24edd039ff249672fdf6f2ba5695