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authorRonnie Sahlberg <lsahlber@redhat.com>2020-07-09 13:39:49 +0300
committerSteve French <stfrench@microsoft.com>2020-07-09 18:06:52 +0300
commita77592a70081edb58a95b9da18fd5a2882a25666 (patch)
treef5a2039f848d64bec99e120c65c4e6261b3eed8b /fs
parent8668115cf2db40e22e7be02652a3673d8d30c9f0 (diff)
downloadlinux-a77592a70081edb58a95b9da18fd5a2882a25666.tar.xz
cifs: fix reference leak for tlink
Don't leak a reference to tlink during the NOTIFY ioctl Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> CC: Stable <stable@vger.kernel.org> # v5.6+
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/ioctl.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 4a73e63c4d43..dcde44ff6cf9 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -169,6 +169,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
unsigned int xid;
struct cifsFileInfo *pSMBFile = filep->private_data;
struct cifs_tcon *tcon;
+ struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb;
__u64 ExtAttrBits = 0;
__u64 caps;
@@ -307,13 +308,19 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
break;
}
cifs_sb = CIFS_SB(inode->i_sb);
- tcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ break;
+ }
+ tcon = tlink_tcon(tlink);
if (tcon && tcon->ses->server->ops->notify) {
rc = tcon->ses->server->ops->notify(xid,
filep, (void __user *)arg);
cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
} else
rc = -EOPNOTSUPP;
+ cifs_put_tlink(tlink);
break;
default:
cifs_dbg(FYI, "unsupported ioctl\n");