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.

https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421

https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153

https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb

https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281

https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20

https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f

https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63

https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a

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