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cifs: avoid NULL pointer dereference in dbg call

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[ Upstream commit b4885bd593 ]

cifs_server_dbg() implies server to be non-NULL so
move call under condition to avoid NULL pointer dereference.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e79b0332ae ("cifs: ignore cached share root handle closing errors")
Cc: stable@vger.kernel.org
Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandra Diupina 2025-03-19 17:28:58 +03:00 committed by Greg Kroah-Hartman
parent cad91c15b8
commit ba3ce6c60c
1 changed files with 5 additions and 4 deletions
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9
fs/cifs/smb2misc.c
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@ -809,11 +809,12 @@ smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
spin_unlock(&cifs_tcp_ses_lock);
if (tcon->ses)
if (tcon->ses) {
server = tcon->ses->server;
cifs_server_dbg(FYI, "tid=0x%x: tcon is closing, skipping async close retry of fid %llu %llu\n",
tcon->tid, persistent_fid, volatile_fid);
cifs_server_dbg(FYI,
"tid=0x%x: tcon is closing, skipping async close retry of fid %llu %llu\n",
tcon->tid, persistent_fid, volatile_fid);
}
return 0;
}