CVE-2026-31435netfs: Fix read abandonment during retry

Official description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix read abandonment during retry Under certain circumstances, all the remaining subrequests from a read request will get abandoned during retry. The abandonment process expects the 'subreq' variable to be set to the place to start abandonment from, but it doesn't always have a useful value (it will be uninitialised on the first pass through the loop and it may point to a deleted subrequest on later passes). Fix the first jump to "abandon:" to set subreq to the start of the first subrequest expected to need retry (which, in this abandonment case, turned out unexpectedly to no longer have NEED_RETRY set). Also clear the subreq pointer after discarding superfluous retryable subrequests to cause an oops if we do try to access it.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/3e5fd8f53b575ff2188f82071da19c977ca56c41
• https://git.kernel.org/stable/c/8f2f2bd128a8d9edbc1e785760da54ada3df69b7
• https://git.kernel.org/stable/c/7e57523490cd2efb52b1ea97f2e0a74c0fb634cd