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smb: client: allow parsing zero-length AV pairs

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Zero-length AV pairs should be considered as valid target infos.
Don't skip the next AV pairs that follow them.

Cc: linux-cifs@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
Fixes: 0e8ae9b953 ("smb: client: parse av pair type 4 in CHALLENGE_MESSAGE")
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2025-07-25 00:04:43 -03:00 committed by Steve French
parent 3edc68de56
commit be77ab6b9f
1 changed files with 2 additions and 2 deletions
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4
fs/smb/client/cifsencrypt.c
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@ -343,7 +343,7 @@ static struct ntlmssp2_name *find_next_av(struct cifs_ses *ses,
len = AV_LEN(av);
if (AV_TYPE(av) == NTLMSSP_AV_EOL)
return NULL;
if (!len || (u8 *)av + sizeof(*av) + len > end)
if ((u8 *)av + sizeof(*av) + len > end)
return NULL;
return av;
}
@ -363,7 +363,7 @@ static int find_av_name(struct cifs_ses *ses, u16 type, char **name, u16 maxlen)
av_for_each_entry(ses, av) {
len = AV_LEN(av);
if (AV_TYPE(av) != type)
if (AV_TYPE(av) != type || !len)
continue;
if (!IS_ALIGNED(len, sizeof(__le16))) {
cifs_dbg(VFS | ONCE, "%s: bad length(%u) for type %u\n",