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-rw-r--r--builtin/update-index.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/builtin/update-index.c b/builtin/update-index.c
index ba54e19cd5..ebea285e1b 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -637,6 +637,9 @@ static int parse_new_style_cacheinfo(const char *arg,
unsigned long ul;
char *endp;
+ if (!arg)
+ return -1;
+
errno = 0;
ul = strtoul(arg, &endp, 8);
if (errno || endp == arg || *endp != ',' || (unsigned int) ul != ul)