grep: do not segfault when -f is used

diff --git a/builtin-grep.c b/builtin-grep.c
index fd450bc16e56a634b14cfa33f77e5192412643d8..e3b940b93334f99f610f84a86c9da11a435d1365 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -599,7 +599,7 @@ static int file_callback(const struct option *opt, const char *arg, int unset)
        struct grep_opt *grep_opt = opt->value;
        FILE *patterns;
        int lno = 0;
-       struct strbuf sb;
+       struct strbuf sb = STRBUF_INIT;
 
        patterns = fopen(arg, "r");
        if (!patterns)