Re: [BUG] nullptr-with-offset growjobtab() src/jobs.c:818:34
Aleksander Ushakov <[email protected]> Fri, 23 Jan 2026 15:43:54 +0300
| Newsgroups | org.kernel.vger.dash |
|---|---|
| Message-ID | <CADdNFatsHjyyxSVE4Zj+CumzCpY_5+bRKN1weTiedjRPd63-fg@mail.gmail.com> |
I checked it on the latest clang 21.1.8. The problem has disappeared.
But the problem keeps on older versions of clang.
If we open C17 standard, then we can see
"""
If both the pointer operand and the result point to elements of the
same array object, or one past the last element of the array object,
the evaluation shall not produce an overflow; otherwise, the behavior
is undefined.
"""
The problem place of code:
jq = (struct job *)((char *)jq + l);
A condition of C standard is 'pointer operand' and 'result' should
point to elements of the same array. But jq is nullptr. So jq and jq
+ l point to elements of not same array, then the condition isn't
complete.
May be just apply the simple patch?
diff --git a/src/jobs.c b/src/jobs.c
index 6622bdd..89417c3 100644
--- a/src/jobs.c
+++ b/src/jobs.c
@@ -812,7 +812,7 @@ growjobtab(void)
jp = ckrealloc(jq, len + 4 * sizeof(*jp));
offset = (char *)jp - (char *)jq;
- if (offset) {
+ if (offset && jq) {
/* Relocate pointers */
size_t l = len;
So the behaviour is same with
https://www.spinics.net/lists/dash/msg02872.html. And the input data
can be taken from there (first bug report). When I tested it on my
system, sudo wasn't installed
.
>
> I encountered a bug in Dash 0.5.13 (on commit
> 5139d6a27763fc0be386e15634db21e45598b299) and would like to report it.
> The details are provided below.
>
> jobs.c:818:34: runtime error: applying zero offset to null pointer
> #0 0x586492cd930b in growjobtab /upstream/ub/src/jobs.c:818:34
> #1 0x586492cd8e45 in makejob /upstream/ub/src/jobs.c:773:9
> #2 0x586492cdacc8 in vforkexec /upstream/ub/src/jobs.c:985:7
> #3 0x586492cbacb7 in evalcommand /upstream/ub/src/eval.c:901:9
> #4 0x586492cb7f9c in evaltree /upstream/ub/src/eval.c:299:12
> #5 0x586492cdf69c in cmdloop /upstream/ub/src/main.c:242:8
> #6 0x586492cdf35a in main /upstream/ub/src/main.c:176:3
> #7 0x7fe9eb831249 in __libc_start_call_main
> csu/../sysdeps/nptl/libc_start_call_main.h:58:16
> #8 0x7fe9eb831304 in __libc_start_main csu/../csu/libc-start.c:360:3
> #9 0x586492c86850 in _start (/upstream/ub/src/dash+0x3e850)
> (BuildId: e68b2d28b6287f88e673d7eb3b1d49090e50fd76)
>
> SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset jobs.c:818:34
> Aborted (core dumped)
>
> ////////////////
> Place in the code:
> ////////////////
>
> if (offset) {
> /* Relocate pointers */
> size_t l = len;
>
> ------------>jq = (struct job *)((char *)jq + l);
> while (l) {
> l -= sizeof(*jp);
> jq--;
> #define
>
> ////////////////
> My environment:
> ////////////////
>
> Debian-12, x86-64, clang-19 compiler
>
> /////////////////
> Steps to reproduce:
> /////////////////
>
> $ aclocal && autoheader && automake --add-missing && autoconf
> $ CC=clang CFLAGS=" -Wno-everything -fsanitize=undefined -g -O0"
> ./configure --disable-fnmatch --disable-lineno --disable-glob
> $ make
> $ cd src
> $ export UBSAN_OPTIONS=print_stacktrace=true,symbolize=true,print_stacktrace=1,report_error_type=1,symbolize=1
> $ ./dash < myfile.txt
>
> //////////////////
> Steps to get myfile.txt:
> //////////////////
>
> copy the text into file bs64.txt (between ==== and ======):
>
> =====================================================================================
> JFxf/6QAgCAwCmNkIC0KY2QgLS0tCgplY2hvIBB8fCAuAGZ3d3d3d3d3d3d3d3d3d3d3d3d3d3d3
> d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3d3
> d3d3d3d3d3d3d3d3d3d3d3d3d3d3dwoyPiYxCgoKCgoKaWxlCiQqKgoyPiYxCgoKCgoKaWxlCgoK
> Dw9/Dw8CCiQkJCQ4WwpjZApjZApjZCAtAAIgMIAgMGRisbFjZCAtAAB//wpjZCAtCmNkIAABYyAw
> CmNkIC0KY2QgAgICAKckMUUkMSQlJCQuJDpbpyQxRSQxJCQkJCQCJCQkJBgkJCQkJCQkJCQkJCTb
> JP8AZfAkJCQkJGMg/y+SkpKSkpKSaGUD6HAWbyDkPiYxJEAgAEQg4eHh4eHh4W8gfiRAYGBgYIMA
> H5KSkpKSkiQkQCQkAIAkAgIvCm5kCmhl//99Y2NjY2NjY2NjY2NjY2Njd2NjY4NjY2NjY2NjY2Nj
> Y2NjY2NBY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjYyRmCmMoKS8KY2gAAAAgLwpjKCkgCmM9fiB2
> aWw9fiBlY2ggKip7UGg5NGP/f3syWDRjICR7MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIx
> MjIyMjIlOjIyMjIyJToqfYM9ezJYNGMgJHsyMjIyMjIyMjIyJTJEM00kKCghHP9/QEIpKWVjaDIy
> NzoqfXiDQGo5ADfn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+7n
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 52Nhc2Xn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fm5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fnIyQk
> JCQkbyBobyBlBXZmPiYtIH5pbOfn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fnIC8KYyAAIApEZCAvCmNkCh16Cgo/ASAtACAgCgo/ASAtACAOMApjYyAtCmNkIC8K
> Y2QKHaX/pACAIDAKY2MELQpjIz8BIC0AICAKCj8BIC0AICAKCj8BIC0A5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn59Hn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fnfOfn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fnAH//CmNkIC0KY2QgLWQgIApuZApjZCAuCmMtCmNkIC0KYyAwCmNkCmNkIC0KY2QgLQpjIDAA
> AUQgLQpjZCAvCmNkIC1jIDAKaAH65+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5y1S5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn58fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5Ofn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> 5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn
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> =====================================================================================