From ef5a788527b2038d742b057a415ab4d0e735e98f Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Thu, 5 Nov 2015 18:53:03 -0500
Subject: [PATCH] qemu-io: Check for trailing chars

Make sure there's not trailing garbage, e.g.
"64k-whatever-i-want-here"

Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qemu-io-cmds.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 1e97f69f56..7ebe89a1d8 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -136,7 +136,14 @@ static char **breakline(char *input, int *count)
 static int64_t cvtnum(const char *s)
 {
     char *end;
-    return qemu_strtosz_suffix(s, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+    int64_t ret;
+
+    ret = qemu_strtosz_suffix(s, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+    if (*end != '\0') {
+        /* Detritus at the end of the string */
+        return -EINVAL;
+    }
+    return ret;
 }
 
 #define EXABYTES(x)     ((long long)(x) << 60)