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cifs: validate idmap key payload length

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The cifs.idmap key type stores its payload length in key->datalen, which
is limited to U16_MAX.  Accepting a larger key payload truncates the
recorded length and can make later users interpret the payload using
inconsistent bounds.

Reject oversized preparsed payloads before allocating or copying them.
This keeps key->datalen consistent with the stored data for both inline
and separately allocated idmap payloads.

Signed-off-by: Li Qiang <liqiang01@kylinos.cn>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Li Qiang 2026-07-19 00:22:27 +08:00 committed by Steve French
parent aed0714255
commit 455488cd50
1 changed files with 3 additions and 0 deletions
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3
fs/smb/client/cifsacl.c
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@ -68,6 +68,9 @@ cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
{
char *payload;
if (prep->datalen > U16_MAX)
return -EINVAL;
/*
* If the payload is less than or equal to the size of a pointer, then
* an allocation here is wasteful. Just copy the data directly to the