CVE-2024-50216: xfs: fix finding a last resort AG in xfs_filestream_pick_ag

First published: Sat Nov 09 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: xfs: fix finding a last resort AG in xfs_filestream_pick_ag When the main loop in xfs_filestream_pick_ag fails to find a suitable AG it tries to just pick the online AG. But the loop for that uses args->pag as loop iterator while the later code expects pag to be set. Fix this by reusing the max_pag case for this last resort, and also add a check for impossible case of no AG just to make sure that the uninitialized pag doesn't even escape in theory.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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