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* [Bug analyzer/116006] New: RFE: detect usage of pointers to local variables that are out of scope
@ 2024-07-19 16:48 dmalcolm at gcc dot gnu.org
2024-07-19 17:06 ` [Bug analyzer/116006] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: dmalcolm at gcc dot gnu.org @ 2024-07-19 16:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116006
Bug ID: 116006
Summary: RFE: detect usage of pointers to local variables that
are out of scope
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: analyzer
Assignee: dmalcolm at gcc dot gnu.org
Reporter: dmalcolm at gcc dot gnu.org
Target Milestone: ---
Consider e.g.:
struct A *extref = something;
...
for (int i = 0; i < n; i++)
{
struct A intref = *extref;
intref.memb = i;
extref = &intref;
}
This is storing a pointer to local variable "intref" into extref.
I think we detect the case where someone tries to use *extref once the function
frame has been popped (via the poisoned_svalue machinery) but I don't think we
detect the case where the usage happens in the same function but outside the
scope of "intref".
Trying it out here: https://godbolt.org/z/6s9WMh53K but I can't seem to trigger
even the popped frame case
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug analyzer/116006] RFE: detect usage of pointers to local variables that are out of scope
2024-07-19 16:48 [Bug analyzer/116006] New: RFE: detect usage of pointers to local variables that are out of scope dmalcolm at gcc dot gnu.org
@ 2024-07-19 17:06 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-07-19 17:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116006
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2024-07-19
Status|UNCONFIRMED |NEW
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. I though we had a warning about escaping local addresses but I can't
seem to get it to hit for this case.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-07-19 16:48 [Bug analyzer/116006] New: RFE: detect usage of pointers to local variables that are out of scope dmalcolm at gcc dot gnu.org
2024-07-19 17:06 ` [Bug analyzer/116006] " pinskia at gcc dot gnu.org
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