Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin(). However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to dereference is the one specified by ->no_unlock_folio as ownership immediately reverts to the caller. Fix this by storing the folio pointer instead and using that rather than the index. Also fix netfs_unlock_read_folio() where the same applies.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ee4cdf7ba857a894ad1650d6ab77669cbbfa329e to < d4ae8dba90b89e7bb4d1045d1cb26afbaf13ee5caffectedee4cdf7ba857a894ad1650d6ab77669cbbfa329e to < 6080fa3ecfbb4448a3b47368629534c09b6ec750affectedee4cdf7ba857a894ad1650d6ab77669cbbfa329e to < 3866d015f33aeedf81338dd99154703bef33faefaffectedee4cdf7ba857a894ad1650d6ab77669cbbfa329e to < dbe556972100fabb8e5a1b3d2163831ff07b1e8eaffected
Linux Linux
Default version status: affected
6.12affected0 to < 6.12unaffected6.12.106 to ≤ 6.12.*unaffected6.18.34 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected