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authorZhangXiaoxu <zhangxiaoxu5@huawei.com>2019-04-06 15:47:38 +0800
committerSteve French <stfrench@microsoft.com>2019-04-16 09:38:18 -0500
commit6a3eb3360667170988f8a6477f6686242061488a (patch)
tree6ed3efc4006d230c586e9b2e0fd5f9bdbb6e2166 /fs/cifs
parent618d919cae2fcaadc752f27ddac8b939da8b441a (diff)
cifs: Fix use-after-free in SMB2_write
There is a KASAN use-after-free: BUG: KASAN: use-after-free in SMB2_write+0x1342/0x1580 Read of size 8 at addr ffff8880b6a8e450 by task ln/4196 Should not release the 'req' because it will use in the trace. Fixes: eccb4422cf97 ("smb3: Add ftrace tracepoints for improved SMB3 debugging") Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org> 4.18+ Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2pdu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 21ad01d55ab2..5d1f8d2d44e4 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3769,7 +3769,6 @@ SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
&resp_buftype, flags, &rsp_iov);
- cifs_small_buf_release(req);
rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
if (rc) {
@@ -3787,6 +3786,7 @@ SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
io_parms->offset, *nbytes);
}
+ cifs_small_buf_release(req);
free_rsp_buf(resp_buftype, rsp);
return rc;
}