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authorXiyu Yang <xiyuyang19@fudan.edu.cn>2020-06-13 15:27:09 +0300
committerSteve French <stfrench@microsoft.com>2020-06-22 06:34:50 +0300
commit77577de64167aa0643d47ffbaacf3642632b321b (patch)
tree716a34f394299cd51aa264953a0614e6f6405dbd /fs/cifs
parent48778464bb7d346b47157d21ffde2af6b2d39110 (diff)
downloadlinux-77577de64167aa0643d47ffbaacf3642632b321b.tar.xz
cifs: Fix cached_fid refcnt leak in open_shroot
open_shroot() invokes kref_get(), which increases the refcount of the "tcon->crfid" object. When open_shroot() returns not zero, it means the open operation failed and close_shroot() will not be called to decrement the refcount of the "tcon->crfid". The reference counting issue happens in one normal path of open_shroot(). When the cached root have been opened successfully in a concurrent process, the function increases the refcount and jump to "oshr_free" to return. However the current return value "rc" may not equal to 0, thus the increased refcount will not be balanced outside the function, causing a refcnt leak. Fix this issue by setting the value of "rc" to 0 before jumping to "oshr_free" label. Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2ops.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 736d86b8a910..28553d45604e 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -763,6 +763,7 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon,
/* close extra handle outside of crit sec */
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
}
+ rc = 0;
goto oshr_free;
}