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-rw-r--r--external/zlib/ubsan.patch11
1 files changed, 11 insertions, 0 deletions
diff --git a/external/zlib/ubsan.patch b/external/zlib/ubsan.patch
new file mode 100644
index 000000000..2d7ff8d67
--- /dev/null
+++ b/external/zlib/ubsan.patch
@@ -0,0 +1,11 @@
+--- trees.c
++++ trees.c
+@@ -870,7 +870,7 @@
+ bi_windup(s); /* align on byte boundary */
+ put_short(s, (ush)stored_len);
+ put_short(s, (ush)~stored_len);
+- zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
++ if (stored_len != 0) zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
+ s->pending += stored_len;
+ #ifdef ZLIB_DEBUG
+ s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;