block: Do not strcmp() with NULL uri->scheme

uri_parse(...)->scheme may be NULL. In fact, probably every field may be
NULL, and the callers do test this for all of the other fields but not
for scheme (except for block/gluster.c; block/vxhs.c does not access
that field at all).

We can easily fix this by using g_strcmp0() instead of strcmp().

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20170613205726.13544-1-mreitz@redhat.com
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit f69165a8feca055cf4a37d13ab0fc5beec3cb372)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/block/nbd.c b/block/nbd.c
index b3545f570984a67a9e46a90dd43e7050d689a19d..9a54edfcde5671b675a0c7695880524fa42ecdbe 100644 (file)
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -65,11 +65,11 @@ static int nbd_parse_uri(const char *filename, QDict *options)
     }
 
     /* transport */
-    if (!strcmp(uri->scheme, "nbd")) {
+    if (!g_strcmp0(uri->scheme, "nbd")) {
         is_unix = false;
-    } else if (!strcmp(uri->scheme, "nbd+tcp")) {
+    } else if (!g_strcmp0(uri->scheme, "nbd+tcp")) {
         is_unix = false;
-    } else if (!strcmp(uri->scheme, "nbd+unix")) {
+    } else if (!g_strcmp0(uri->scheme, "nbd+unix")) {
         is_unix = true;
     } else {
         ret = -EINVAL;

diff --git a/block/nfs.c b/block/nfs.c
index bfeebc10446384a767b4c1f09c16dbcc0aa259cc..344186f6219d9f0c1e63585217fbce6eea6e9496 100644 (file)
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -83,7 +83,7 @@ static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
         error_setg(errp, "Invalid URI specified");
         goto out;
     }
-    if (strcmp(uri->scheme, "nfs") != 0) {
+    if (g_strcmp0(uri->scheme, "nfs") != 0) {
         error_setg(errp, "URI scheme must be 'nfs'");
         goto out;
     }

diff --git a/block/sheepdog.c b/block/sheepdog.c
index fb9203e9be37eaab274d20653d8ce804d036c5b4..2d8d8c835fb0470ceae2657268a4ecdfbfaa8006 100644 (file)
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1052,11 +1052,11 @@ static void sd_parse_uri(SheepdogConfig *cfg, const char *filename,
     }
 
     /* transport */
-    if (!strcmp(uri->scheme, "sheepdog")) {
+    if (!g_strcmp0(uri->scheme, "sheepdog")) {
         is_unix = false;
-    } else if (!strcmp(uri->scheme, "sheepdog+tcp")) {
+    } else if (!g_strcmp0(uri->scheme, "sheepdog+tcp")) {
         is_unix = false;
-    } else if (!strcmp(uri->scheme, "sheepdog+unix")) {
+    } else if (!g_strcmp0(uri->scheme, "sheepdog+unix")) {
         is_unix = true;
     } else {
         error_setg(&err, "URI scheme must be 'sheepdog', 'sheepdog+tcp',"

diff --git a/block/ssh.c b/block/ssh.c
index 34a2f791dc4b7243a9786f04c7ece65613422553..139b05d1c3b85c75f13af0383a4aac0bf141e6b6 100644 (file)
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -205,7 +205,7 @@ static int parse_uri(const char *filename, QDict *options, Error **errp)
         return -EINVAL;
     }
 
-    if (strcmp(uri->scheme, "ssh") != 0) {
+    if (g_strcmp0(uri->scheme, "ssh") != 0) {
         error_setg(errp, "URI scheme must be 'ssh'");
         goto err;
     }