SetFontCatalogue: handle allocation failure

difs/fonts.c: In function ‘SetFontCatalogue’:
difs/fonts.c:766:14: warning: dereference of possibly-NULL ‘p’ [CWE-690]
 [-Wanalyzer-possible-null-dereference]
  766 |         *p++ = len = end - str;
      |         ~~~~~^~~~~~~~~~~~~~~~~

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/app/xfs/-/merge_requests/7>

1 files changed, 2 insertions, 0 deletions

diff --git a/difs/fonts.c b/difs/fonts.c
index a745503..7b234bb 100644
--- a/difs/fonts.c
+++ b/difs/fonts.c
@@ -757,6 +757,8 @@ SetFontCatalogue(
     len = strlen(str) + 1;
     paths = p = (char *) ALLOCATE_LOCAL(len);
     npaths = 0;
+    if (p == NULL)
+        return FSBadAlloc;
 
     while (*str) {
 	end = index(str, ',');