xfs: fix finding a last resort AG in xfs_filestream_pick_ag

Vulnerability Description

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.

References

• https://git.kernel.org/stable/c/77ddc732416b017180893cbb2356e9f0a414c575
• https://git.kernel.org/stable/c/a023408925acd64db5c8980373fcb3e28ec6fd29
• https://git.kernel.org/stable/c/dc60992ce76fbc2f71c2674f435ff6bde2108028