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authorRohith Surabattula <rohiths@microsoft.com>2020-10-29 09:07:56 +0300
committerSteve French <stfrench@microsoft.com>2020-11-16 08:05:33 +0300
commit1254100030b3377e8302f9c75090ab191d73ee7c (patch)
tree3bfdd0d58a3026cdb5d39d37db087b1d759f85f7 /fs/cifs/smb2ops.c
parentac873aa3dc21707c47db5db6608b38981c731afe (diff)
downloadlinux-1254100030b3377e8302f9c75090ab191d73ee7c.tar.xz
smb3: Handle error case during offload read path
Mid callback needs to be called only when valid data is read into pages. These patches address a problem found during decryption offload: CIFS: VFS: trying to dequeue a deleted mid that could cause a refcount use after free: Workqueue: smb3decryptd smb2_decrypt_offload [cifs] Signed-off-by: Rohith Surabattula <rohiths@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> CC: Stable <stable@vger.kernel.org> #5.4+ Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2ops.c')
-rw-r--r--fs/cifs/smb2ops.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index b3b2abbb49b9..dab94f67c988 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -4559,7 +4559,25 @@ static void smb2_decrypt_offload(struct work_struct *work)
dw->server->vals->read_rsp_size,
dw->ppages, dw->npages, dw->len,
true);
- mid->callback(mid);
+ if (rc >= 0) {
+#ifdef CONFIG_CIFS_STATS2
+ mid->when_received = jiffies;
+#endif
+ mid->callback(mid);
+ } else {
+ spin_lock(&GlobalMid_Lock);
+ if (dw->server->tcpStatus == CifsNeedReconnect) {
+ mid->mid_state = MID_RETRY_NEEDED;
+ spin_unlock(&GlobalMid_Lock);
+ mid->callback(mid);
+ } else {
+ mid->mid_state = MID_REQUEST_SUBMITTED;
+ mid->mid_flags &= ~(MID_DELETED);
+ list_add_tail(&mid->qhead,
+ &dw->server->pending_mid_q);
+ spin_unlock(&GlobalMid_Lock);
+ }
+ }
cifs_mid_q_entry_release(mid);
}