From: Henrique Carvalho Date: Thu, 18 Jun 2026 20:34:37 +0000 (-0300) Subject: smb: client: fix change notify replay double-free X-Git-Tag: v7.2-rc1~24^2~11 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=145f820dcbb2cced374f2532f8a61a44dce4a615;p=thirdparty%2Flinux.git smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free. Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set") Cc: stable@vger.kernel.org Signed-off-by: Henrique Carvalho Signed-off-by: Steve French --- diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 6e6aed87ab0a0..7d4b37b776c5e 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -4116,6 +4116,8 @@ SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, replay_again: /* reinitialize for possible replay */ + resp_buftype = CIFS_NO_BUFFER; + memset(&rsp_iov, 0, sizeof(rsp_iov)); flags = 0; server = cifs_pick_channel(ses);