[sysprof/gbsneto/fix-rpi4-crash] details-page: Protect against NULL line

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit a67701848dfe0f5ceeaadcc47df99a0663a1e0b9
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Dec 30 14:03:15 2019 -0300

    details-page: Protect against NULL line
    
    On a Raspberry PI 4, Sysprof crashes immediately when
    trying to memchr() on the 'line' variable. The current
    RPI4 support is poor on Linux mainline admitedly, but
    having Sysprof to work on it at least gives us a chance
    to profile the major bottlenecks.
    
    Protect against NULL 'line'.

 src/libsysprof-ui/sysprof-details-page.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/libsysprof-ui/sysprof-details-page.c b/src/libsysprof-ui/sysprof-details-page.c
index 03963c5..daee548 100644
--- a/src/libsysprof-ui/sysprof-details-page.c
+++ b/src/libsysprof-ui/sysprof-details-page.c
@@ -142,8 +142,12 @@ cpu_info_cb (const SysprofCaptureFrame *frame,
   const gchar *line;
   gchar **str = user_data;
 
-  endptr = (gchar *)fc->data + fc->len;
   line = memmem ((gchar *)fc->data, fc->len, "model name", 10);
+
+  if (!line)
+    return FALSE;
+
+  endptr = (gchar *)fc->data + fc->len;
   endptr = memchr (line, '\n', endptr - line);
 
   if (endptr)