diff options
| author | Ronnie Sahlberg <lsahlber@redhat.com> | 2020-02-18 23:01:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 09:53:10 +0300 |
| commit | 1c089287cecad0d10791fd849b185293f22182f7 (patch) | |
| tree | ef8f1a6ac13377305862839cfb40f323ee1d32a9 | |
| parent | cfbd8af0ad0cd3f7159fadd8e4302bcd449feee7 (diff) | |
| download | linux-1c089287cecad0d10791fd849b185293f22182f7.tar.xz | |
cifs: don't leak -EAGAIN for stat() during reconnect
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>
| -rw-r--r-- | fs/cifs/inode.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 7dda3f137c7a..dfa85ad5b481 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1990,6 +1990,7 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry) 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 dentry *dentry) 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; } |