include/strutils: fix heap-buffer-overflow in normalize_whitespace()

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/include/strutils.h b/include/strutils.h
index 7969a84d0ccaa357f0fc34aa26e77d134c5ce650..2e5a2aad4cec0620c4d5911fbed985bb58d03b1d 100644 (file)
--- a/include/strutils.h
+++ b/include/strutils.h
@@ -334,7 +334,7 @@ static inline size_t normalize_whitespace(unsigned char *str)
                else
                        str[x++] = str[i++];
        }
-       if (nsp)                /* tailing space */
+       if (nsp && x > 0)       /* tailing space */
                x--;
        str[x] = '\0';
        return x;