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cifs: add NULL check for ses->tcon_ipc

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In some scenarios (DFS and BAD_NETWORK_NAME) set_root_set() can be
called with a NULL ses->tcon_ipc.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2020-12-03 19:46:08 +01:00 committed by Steve French
parent 7963178485
commit 59463eb888
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/connect.c
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@ -4546,7 +4546,8 @@ static void set_root_ses(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
if (ses) {
spin_lock(&cifs_tcp_ses_lock);
ses->ses_count++;
ses->tcon_ipc->remap = cifs_remap(cifs_sb);
if (ses->tcon_ipc)
ses->tcon_ipc->remap = cifs_remap(cifs_sb);
spin_unlock(&cifs_tcp_ses_lock);
}
*root_ses = ses;