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From: Wasser Mai <wasser19641@HIDDEN>
Date: Mon, 22 Jul 2024 19:29:18 +0200
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There's a following defect in diffutils-3.10 (gnulib) found by
covscan. The memory dfa->eclosure points to is not initialized. It
looks like a true positive.

Error: UNINIT (CWE-457):
diffutils-3.10/lib/regcomp.c:1134: alloc_fn: Calling "malloc" which
returns uninitialized memory.
diffutils-3.10/lib/regcomp.c:1134: assign: Assigning: "dfa->eclosures"
= "(re_node_set *)malloc(dfa->nodes_alloc * 24UL)", which points to
uninitialized data.
diffutils-3.10/lib/regcomp.c:1177: uninit_use_in_call: Using
uninitialized value "dfa->eclosures->elems" when calling
"calc_inveclosure".
diffutils-3.10/lib/regcomp.c:1177: uninit_use_in_call: Using
uninitialized value "dfa->eclosures->nelem" when calling
"calc_inveclosure".
# 1226|         if (__glibc_unlikely (dfa->inveclosures == NULL))
# 1227|           return REG_ESPACE;
# 1228|->       ret = calc_inveclosure (dfa);
# 1229|       }
# 1230|

maybe add a loop to iterate through all elements and call
re_node_set_init_empty to initialize each element like this?

diff -up diffutils-3.10/lib/regcomp.c.orig diffutils-3.10/lib/regcomp.c
--- diffutils-3.10/lib/regcomp.c.orig   2024-07-22 19:06:27.783986757 +0200
+++ diffutils-3.10/lib/regcomp.c        2024-07-22 19:10:41.303397164 +0200
@@ -1136,6 +1136,10 @@ analyze (regex_t *preg)
                       || dfa->edests == NULL || dfa->eclosures == NULL))
    return REG_ESPACE;

+  // Initialize each element (for example, set them all to an empty node set)
+  for (Idx i = 0; i < dfa->nodes_alloc; ++i) {
+    re_node_set_init_empty(dfa->eclosures + i);
+  }
  dfa->subexp_map = re_malloc (Idx, preg->re_nsub);
  if (dfa->subexp_map != NULL)
    {

Thanks!
Wasser




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Wasser Mai <wasser19641@HIDDEN>
Subject: bug#72251: Acknowledgement (defect found by covscan in
 diffutils-3.10 (gnulibs))
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Subject: bug#72251: [bug-diffutils] bug#72251: defect found by covscan in diffutils-3.10 (gnulibs)
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On 2024-07-22 10:29, Wasser Mai wrote:
> There's a following defect in diffutils-3.10 (gnulib) found by
> covscan. The memory dfa->eclosure points to is not initialized. It
> looks like a true positive.

It doesn't look like a true positive to me. The 'postorder' function 
initializes that memory, but covscan isn't smart enough to see that.

These days almost everything Coverity reports for core GNU utilities is 
a false positive, unfortunately.




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tags 73783 fixed
close 73783
tags 63333 fixed
close 63333
tags 73139 fixed
close 73139
tags 72251 notabug
close 72251
tags 71529 moreinfo
severity 69723 wishlist
tags 68966 notabug
close 68966
tags 65004 fixed
close 65004





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tags 73783 fixed
close 73783
tags 63333 fixed
close 63333
tags 73139 fixed
close 73139
tags 72251 notabug
close 72251
tags 71529 moreinfo
severity 69723 wishlist
tags 68966 notabug
close 68966
tags 65004 fixed
close 65004






Last modified: Mon, 24 Mar 2025 23:45:01 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.