From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx> Reviewed-by: Aurelien Aptel <aaptel@xxxxxxxx> CC: Stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1998,6 +1998,7 @@ 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; @@ -2019,15 +2020,18 @@ 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; }
