hexdump: fix SEGV in hexdump -e ""

1 files changed, 3 insertions, 2 deletions

diff --git a/libbb/dump.c b/libbb/dump.c
index 74c5e1691..e7722de5a 100644
--- 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;