diff --git a/src/util/softfloat.c b/src/util/softfloat.c
index 50cf098fd9f..cc386aa46fb 100644
--- a/src/util/softfloat.c
+++ b/src/util/softfloat.c
@@ -393,6 +393,7 @@ _mesa_shift_right_jam_m(uint8_t size_words, const uint32_t *a, uint32_t dist, ui
 
     word_jam = 0;
     word_dist = dist >> 5;
+    tmp = NULL;
     if (word_dist) {
         if (size_words < word_dist)
             word_dist = size_words;
@@ -428,10 +429,12 @@ _mesa_shift_right_jam_m(uint8_t size_words, const uint32_t *a, uint32_t dist, ui
         }
         tmp = m_out + index_multiword_hi(size_words, word_dist);
     }
-    do {
-        *tmp++ = 0;
-        --word_dist;
-    } while (word_dist);
+    if (tmp) {
+       do {
+           *tmp++ = 0;
+           --word_dist;
+       } while (word_dist);
+    }
     if (word_jam)
         m_out[index_word_lo(size_words)] |= 1;
 }