Prevent potential division-by-zero in gzfwrite and gzfread.

1 files changed, 4 insertions, 0 deletions

diff --git a/gzread.c b/gzread.c
index c8ec08f..7319365 100644
--- a/gzread.c
+++ b/gzread.c
@@ -378,6 +378,10 @@ size_t ZEXPORT gzfread(void *buf, size_t size, size_t nitems, gzFile file) {
     size_t len;
     gz_state *state;
 
+    /* Exit early if size is zero, also prevents potential division by zero */
+    if (size == 0)
+        return 0;
+
     /* get internal structure */
     if (file == NULL)
         return 0;