[Bugme-janitors] [Bug 9579] New: Returning from a function with a pointer to a local variable on kernel/sysctl.c

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Sat Dec 15 16:29:56 PST 2007


http://bugzilla.kernel.org/show_bug.cgi?id=9579

           Summary: Returning from a function with a pointer to a local
                    variable on kernel/sysctl.c
           Product: Process Management
           Version: 2.5
     KernelVersion: 2.6.23
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: process_other at kernel-bugs.osdl.org
        ReportedBy: marciobuss at gmail.com


On kernel/sysctl.c, function "start_unregistering" defined at line 1261
returns with a pointer to a deallocated stack memory:

(1) at line 1268 variable "wait" is declared (local scope)
(2) at line 1270 the statement "p->unregistering = &wait" establishes
    the pointer relation
(3) the local scope closes at line 1274 but the pointer relation
    persists after the function returns.


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