[PATCH 4.9 63/88] cifs: dont leak -EAGAIN for stat() during reconnect

Greg Kroah-Hartman
2020-03-10T12:46:35Z

From: Ronnie Sahlberg <lsahlber@redhat.com>

commit fc513fac56e1b626ae48a74d7551d9c35c50129e upstream.

If from cifs_revalidate_dentry_attr() the SMB2/QUERY_INFO call fails with an
error, such as STATUS_SESSION_EXPIRED, causing the session to be reconnected
it is possible we will leak -EAGAIN back to the application even for
system calls such as stat() where this is not a valid error.

Fix this by re-trying the operation from within cifs_revalidate_dentry_attr()
if cifs_get_inode_info*() returns -EAGAIN.

This fixes stat() and possibly also other system calls that uses
cifs_revalidate_dentry*().

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/cifs/inode.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1990,6 +1990,7 @@ int cifs_revalidate_dentry_attr(struct d
struct inode *inode = d_inode(dentry);
struct super_block *sb = dentry->d_sb;
char *full_path = NULL;
+ int count = 0;

if (inode == NULL)
return -ENOENT;
@@ -2011,15 +2012,18 @@ int cifs_revalidate_dentry_attr(struct d
full_path, inode, inode->i_count.counter,
dentry, cifs_get_time(dentry), jiffies);

+again:
if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
else
rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
xid, NULL);
-
+ if (rc == -EAGAIN && count++ < 10)
+ goto again;
out:
kfree(full_path);
free_xid(xid);
+
return rc;
}