In the Linux kernel, the following vulnerability has been resolved:

libceph: Fix potential out-of-bounds access in osdmap_decode()

When decoding osd_state and osd_weight from an incoming osdmap in
osdmap_decode(), both are decoded for each osd, i.e., map->max_osd
times. The ceph_decode_need() check only accounts for
sizeof(*map->osd_weight) once. This can potentially result in an
out-of-bounds memory access if the incoming message is corrupted such
that the max_osd value exceeds the actual content of the osdmap message.

This patch fixes the issue by changing the corresponding part in the
ceph_decode_need() check to account for
map->max_osd*sizeof(*map->osd_weight).

https://git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a

https://git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649

https://git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098

https://git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4

https://git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197

https://git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be

https://git.kernel.org/stable/c/e7187f33c02488697ec0d01d82bf7a3f8deaba8f

https://git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b

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