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* [Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32
@ 2013-12-14 0:57 mpolacek at gcc dot gnu.org
2013-12-14 0:58 ` [Bug sanitizer/59503] " mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2013-12-14 0:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59503
Bug ID: 59503
Summary: Bogus integer-overflow error with long long with -m32
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
We wrongly issue runtime error on:
int
main (void)
{
long long int a = 14;
long int b = 9;
if ((a - b) != 5)
__builtin_abort ();
return 0;
}
$ gcc -O0 -fsanitize=signed-integer-overflow -m32 bug.c
$ ./a.out
bug.c:6:10: runtime error: signed integer overflow: 14 - 9 cannot be
represented in type 'long long int'
Aborted
This happens on PPC64 as well, as the bug is in generic handling of add/sub
instrumentation.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug sanitizer/59503] Bogus integer-overflow error with long long with -m32
2013-12-14 0:57 [Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32 mpolacek at gcc dot gnu.org
@ 2013-12-14 0:58 ` mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2013-12-14 0:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59503
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2013-12-14
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Target Milestone|--- |4.9.0
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I have a fix.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug sanitizer/59503] Bogus integer-overflow error with long long with -m32
2013-12-14 0:57 [Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32 mpolacek at gcc dot gnu.org
2013-12-14 0:58 ` [Bug sanitizer/59503] " mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
@ 2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2013-12-14 12:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59503
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug sanitizer/59503] Bogus integer-overflow error with long long with -m32
2013-12-14 0:57 [Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32 mpolacek at gcc dot gnu.org
2013-12-14 0:58 ` [Bug sanitizer/59503] " mpolacek at gcc dot gnu.org
@ 2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2013-12-14 12:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59503
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Sat Dec 14 12:19:56 2013
New Revision: 205984
URL: http://gcc.gnu.org/viewcvs?rev=205984&root=gcc&view=rev
Log:
PR sanitizer/59503
* internal-fn.c (ubsan_expand_si_overflow_addsub_check): Call
expand_binop with correct optab depending on code.
testsuite/
* c-c++-common/ubsan/pr59503.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/ubsan/pr59503.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/internal-fn.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-12-14 0:57 [Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32 mpolacek at gcc dot gnu.org
2013-12-14 0:58 ` [Bug sanitizer/59503] " mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
2013-12-14 12:20 ` mpolacek at gcc dot gnu.org
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