ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

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MDSMap export_targets entries are monitor controlled. check_new_map()
uses each entry as a bit number in a fixed stack bitmap, so a rank
outside the protocol namespace can make set_bit() write past the end of
the array.

Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not
validate against possible_max_rank here because maps may legitimately
reference ranks beyond a temporarily reduced max_mds.

Cc: stable@vger.kernel.org
Fixes: d517b3983d ("ceph: reconnect to the export targets on new mdsmaps")
Signed-off-by: Jérémy Jean <Jeremy.Jean@oss.cyber.gouv.fr>
Reviewed-by: Alex Markuze <amarkuze@redhat.com>
Signed-off-by: Alex Markuze <amarkuze@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

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Jérémy Jean 2026-08-13 14:00:00 +02:00 • committed by Ilya Dryomov

parent c25aee9c63

commit aedc9053d9

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fs/ceph/mdsmap.c

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