pcre2: Sync with upstream 10.32

1 files changed, 20 insertions, 2 deletions

diff --git a/thirdparty/pcre2/src/pcre2_serialize.c b/thirdparty/pcre2/src/pcre2_serialize.c
index d2cc603cbb..cec1a035d1 100644
--- a/thirdparty/pcre2/src/pcre2_serialize.c
+++ b/thirdparty/pcre2/src/pcre2_serialize.c
@@ -7,7 +7,7 @@ and semantics are as close as possible to those of the Perl 5 language.
 
                        Written by Philip Hazel
      Original API code Copyright (c) 1997-2012 University of Cambridge
-          New API code Copyright (c) 2016-2017 University of Cambridge
+          New API code Copyright (c) 2016-2018 University of Cambridge
 
 -----------------------------------------------------------------------------
 Redistribution and use in source and binary forms, with or without
@@ -127,7 +127,25 @@ dst_bytes += tables_length;
 for (i = 0; i < number_of_codes; i++)
   {
   re = (const pcre2_real_code *)(codes[i]);
-  memcpy(dst_bytes, (char *)re, re->blocksize);
+  (void)memcpy(dst_bytes, (char *)re, re->blocksize);
+  
+  /* Certain fields in the compiled code block are re-set during 
+  deserialization. In order to ensure that the serialized data stream is always 
+  the same for the same pattern, set them to zero here. We can't assume the 
+  copy of the pattern is correctly aligned for accessing the fields as part of 
+  a structure. Note the use of sizeof(void *) in the second of these, to
+  specify the size of a pointer. If sizeof(uint8_t *) is used (tables is a 
+  pointer to uint8_t), gcc gives a warning because the first argument is also a 
+  pointer to uint8_t. Casting the first argument to (void *) can stop this, but 
+  it didn't stop Coverity giving the same complaint. */
+  
+  (void)memset(dst_bytes + offsetof(pcre2_real_code, memctl), 0, 
+    sizeof(pcre2_memctl));
+  (void)memset(dst_bytes + offsetof(pcre2_real_code, tables), 0, 
+    sizeof(void *));
+  (void)memset(dst_bytes + offsetof(pcre2_real_code, executable_jit), 0,
+    sizeof(void *));        
+ 
   dst_bytes += re->blocksize;
   }