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-rw-r--r--delta.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/delta.h b/delta.h
index a15350dabc..9464f3e9b0 100644
--- a/delta.h
+++ b/delta.h
@@ -16,7 +16,8 @@ extern void *patch_delta(void *src_buf, unsigned long src_size,
  * This must be called twice on the delta data buffer, first to get the
  * expected reference buffer size, and again to get the result buffer size.
  */
-static inline unsigned long get_delta_hdr_size(const unsigned char **datap)
+static inline unsigned long get_delta_hdr_size(const unsigned char **datap,
+                                               const unsigned char *top)
 {
         const unsigned char *data = *datap;
         unsigned char cmd;
@@ -26,7 +27,7 @@ static inline unsigned long get_delta_hdr_size(const unsigned char **datap)
                 cmd = *data++;
                 size |= (cmd & ~0x80) << i;
                 i += 7;
-        } while (cmd & 0x80);
+        } while (cmd & 0x80 && data < top);
         *datap = data;
         return size;
 }