Description
In the Linux kernel, the following vulnerability has been resolved: qede: fix off-by-one in BD ring consumption on build_skb failure qede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a NULL return from qede_build_skb(). When it returns NULL under memory pressure, the functions still consume a BD from the ring before returning NULL. The callers then recycle additional BDs, resulting in one extra BD being consumed (off-by-one). This desynchronizes the BD ring, which can corrupt DMA page reference counts and lead to SLUB freelist corruption. Commit 4e910dbe3650 ("qede: confirm skb is allocated before using") added a NULL check inside qede_build_skb() to prevent a NULL pointer dereference, but did not address the missing NULL checks in the callers, making this off-by-one reachable. Fix this by adding NULL checks for the return value of qede_build_skb() in both qede_rx_build_skb() and qede_tpa_rx_build_skb(), returning NULL immediately before any BD ring manipulation.
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
8a8633978b842c88fbcfe00d4e5dde96048f630e to < ecc05d4b20220a09c9c69584fc46ca55248a374aaffected8a8633978b842c88fbcfe00d4e5dde96048f630e to < 07be8b8adf91b7ada4c3dacce064d572a6066421affected8a8633978b842c88fbcfe00d4e5dde96048f630e to < 1624aa100c0b218181aa74e3696a389b509298cbaffected8a8633978b842c88fbcfe00d4e5dde96048f630e to < 0bf78df2d3ecb1f4964ff42a7327d25845955153affected8a8633978b842c88fbcfe00d4e5dde96048f630e to < 814a5edac8c9fc04051808d5faaa93768e989281affected8a8633978b842c88fbcfe00d4e5dde96048f630e to < b066420e57f3402a52c998678b4678252ac9bb63affected8a8633978b842c88fbcfe00d4e5dde96048f630e to < 982d6d6bc059c5dff37a2201c2f08c14bcfcbd20affected8a8633978b842c88fbcfe00d4e5dde96048f630e to < a0a558ca7e75b49e71f8c545c30e8c005e6e4e2faffected
Linux Linux
Default version status: affected
4.18affected0 to < 4.18unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a ↗
- https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421 ↗
- https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb ↗
- https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153 ↗
- https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281 ↗
- https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63 ↗
- https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20 ↗
- https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f ↗