NFSv4.1: zero referring call lists before decoding

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decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so
each referring_call_list starts uninitialized. decode_rc_list() assigns
rcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero
referring calls therefore leaves the pointer uninitialized, and
nfs4_callback_sequence() later passes stale slab contents to kfree().

Allocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is
NULL from the beginning, including valid empty referring call lists.

Fixes: 4aece6a19c ("nfs41: cb_sequence xdr implementation")
Assisted-by: Codex:gpt-5
Signed-off-by: Jérémy Jean <Jeremy.Jean@oss.cyber.gouv.fr>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

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Jérémy Jean 2026-08-20 20:53:29 +00:00 • committed by Trond Myklebust

parent 10f307e525

commit 8fa4804fe6

1 changed files with 1 additions and 1 deletions

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fs/nfs/callback_xdr.c

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