hexdump: fix SEGV in hexdump -e ""

diff --git a/libbb/dump.c b/libbb/dump.c
index 74c5e16..e7722de 100644 (file)
--- a/libbb/dump.c
+++ b/libbb/dump.c
@@ -298,7 +298,7 @@ static void rewrite(priv_dumper_t *dumper, FS *fs)
         * if, rep count is greater than 1, no trailing whitespace
         * gets output from the last iteration of the format unit.
         */
-       for (fu = fs->nextfu;; fu = fu->nextfu) {
+       for (fu = fs->nextfu; fu; fu = fu->nextfu) {
                if (!fu->nextfu && fs->bcnt < dumper->blocksize
                 && !(fu->flags & F_SETREP) && fu->bcnt
                ) {
@@ -723,7 +723,8 @@ void FAST_FUNC bb_dump_add(dumper_t* pub_dumper, const char *fmt)
        nextfupp = &tfs->nextfu;
 
        /* take the format string and break it up into format units */
-       for (p = fmt;;) {
+       p = fmt;
+       for (;;) {
                p = skip_whitespace(p);
                if (!*p) {
                        break;