Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential null-ptr-deref in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. When decoding this CRUSH map in crush_decode(), an array of max_buckets CRUSH buckets is decoded, where some indices may not refer to actual buckets and are therefore set to NULL. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). When decoding a crush_choose_arg_map, a series of choose_args for different buckets is decoded, with the bucket_index being read from the incoming message. It is only checked that the bucket index does not exceed max_buckets, but not that it doesn't point to an index with a NULL bucket. If a (potentially corrupted) message contains a crush_choose_arg_map including such a bucket_index, a null pointer dereference may occur in the subsequent processing when attempting to access the bucket with the given index. This patch fixes the issue by extending the affected check. Now, it is only attempted to access the bucket if it is not NULL.
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
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < d55ffad8d422b5d1cc44dad32bd3d25f4471cd9faffectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < 301286c0ccd37d66b0e40786fd35a4f19cdbd88aaffectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < 7169f326a23d0f547fcd90e68b72fd387622e126affectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < d7a65a34d2453f8cd3e0cc0e1319740af7e24276affectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < 312ec973efac0efb9b9ed64214235910e9ecbaa8affectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < f2f95e6d4b97e70bb876139b0583fc8079983f85affectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < a20e16ebfe2fa65348eb4b2dc7deac330ce03e9caffectedc7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 to < 28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bfaffected
Linux Linux
Default version status: affected
4.13affected0 to < 4.13unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.141 to ≤ 6.6.*unaffected6.12.91 to ≤ 6.12.*unaffected6.18.33 to ≤ 6.18.*unaffected7.0.10 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f ↗
- https://git.kernel.org/stable/c/301286c0ccd37d66b0e40786fd35a4f19cdbd88a ↗
- https://git.kernel.org/stable/c/7169f326a23d0f547fcd90e68b72fd387622e126 ↗
- https://git.kernel.org/stable/c/d7a65a34d2453f8cd3e0cc0e1319740af7e24276 ↗
- https://git.kernel.org/stable/c/312ec973efac0efb9b9ed64214235910e9ecbaa8 ↗
- https://git.kernel.org/stable/c/f2f95e6d4b97e70bb876139b0583fc8079983f85 ↗
- https://git.kernel.org/stable/c/a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c ↗
- https://git.kernel.org/stable/c/28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf ↗