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Change History

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.

https://git.kernel.org/stable/c/3e5fd8f53b575ff2188f82071da19c977ca56c41

https://git.kernel.org/stable/c/7e57523490cd2efb52b1ea97f2e0a74c0fb634cd

https://git.kernel.org/stable/c/8f2f2bd128a8d9edbc1e785760da54ada3df69b7