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.

https://git.kernel.org/stable/c/28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf

https://git.kernel.org/stable/c/301286c0ccd37d66b0e40786fd35a4f19cdbd88a

https://git.kernel.org/stable/c/312ec973efac0efb9b9ed64214235910e9ecbaa8

https://git.kernel.org/stable/c/7169f326a23d0f547fcd90e68b72fd387622e126

https://git.kernel.org/stable/c/a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c

https://git.kernel.org/stable/c/d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f

https://git.kernel.org/stable/c/d7a65a34d2453f8cd3e0cc0e1319740af7e24276

https://git.kernel.org/stable/c/f2f95e6d4b97e70bb876139b0583fc8079983f85

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