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-rw-r--r--src/libutil/str_util.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libutil/str_util.c b/src/libutil/str_util.c
index faa33dc8f..8487e8ef2 100644
--- a/src/libutil/str_util.c
+++ b/src/libutil/str_util.c
@@ -1088,6 +1088,10 @@ rspamd_substring_search (const gchar *in, gsize inlen,
gint d, hash_srch, hash_in;
gsize i, j;
+ if (inlen < srchlen) {
+ return -1;
+ }
+
/* Preprocessing */
for (d = i = 1; i < srchlen; ++i) {
/* computes d = 2^(m-1) with the left-shift operator */