cifs: fix crash in smb2_compound_op()/smb2_set_next_command()

RHBZ: 1722704

In low memory situations the various SMB2_*_init() functions can fail
to allocate a request PDU and thus leave the request iovector as NULL.

If we don't check the return code for failure we end up calling
smb2_set_next_command() with a NULL iovector causing a crash when it tries
to dereference it.

CC: Stable <stable@vger.kernel.org>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

2 files changed, 22 insertions, 1 deletions

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index 278405d26c47..d8d9cdfa30b6 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -120,6 +120,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                 SMB2_O_INFO_FILE, 0,
                                 sizeof(struct smb2_file_all_info) +
                                           PATH_MAX * 2, 0, NULL);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
@@ -147,6 +149,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                         COMPOUND_FID, current->tgid,
                                         FILE_DISPOSITION_INFORMATION,
                                         SMB2_O_INFO_FILE, 0, data, size);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
@@ -163,6 +167,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                         COMPOUND_FID, current->tgid,
                                         FILE_END_OF_FILE_INFORMATION,
                                         SMB2_O_INFO_FILE, 0, data, size);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
@@ -180,6 +186,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                         COMPOUND_FID, current->tgid,
                                         FILE_BASIC_INFORMATION,
                                         SMB2_O_INFO_FILE, 0, data, size);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
@@ -206,6 +214,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                         COMPOUND_FID, current->tgid,
                                         FILE_RENAME_INFORMATION,
                                         SMB2_O_INFO_FILE, 0, data, size);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
@@ -231,6 +241,8 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                                         COMPOUND_FID, current->tgid,
                                         FILE_LINK_INFORMATION,
                                         SMB2_O_INFO_FILE, 0, data, size);
+                if (rc)
+                        goto finished;
                 smb2_set_next_command(tcon, &rqst[num_rqst]);
                 smb2_set_related(&rqst[num_rqst++]);
                 trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index e704e04891fb..0cdc4e47ca87 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2027,6 +2027,10 @@ smb2_set_related(struct smb_rqst *rqst)
         struct smb2_sync_hdr *shdr;
 
         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
+        if (shdr == NULL) {
+                cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
+                return;
+        }
         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
 }
 
@@ -2041,6 +2045,12 @@ smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
         unsigned long len = smb_rqst_len(server, rqst);
         int i, num_padding;
 
+        shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
+        if (shdr == NULL) {
+                cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
+                return;
+        }
+
         /* SMB headers in a compound are 8 byte aligned. */
 
         /* No padding needed */
@@ -2080,7 +2090,6 @@ smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
         }
 
  finished:
-        shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
         shdr->NextCommand = cpu_to_le32(len);
 }