linux-kernel - file removal issue in tools/testing/selftests/powerpc/mm/tlbie

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Date:   Thu, 15 Jun 2023 17:02:18 +0100
From:   "Colin King (gmail)" <colin.i.king@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Shuah Khan <shuah@...nel.org>,
        Nicholas Miehlbradt <nicholas@...ux.ibm.com>,
        Nicholas Miehlbradt <nicholas@...ux.ibm.com>,
        Benjamin Gray <bgray@...ux.ibm.com>
Cc:     "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: file removal issue in tools/testing/selftests/powerpc/mm/tlbie_test.c

Hi,

Static analysis with cppcheck has found an issue in the following commit:

commit 047e6575aec71d75b765c22111820c4776cd1c43
Author: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Date:   Tue Sep 24 09:22:53 2019 +0530

     powerpc/mm: Fixup tlbie vs mtpidr/mtlpidr ordering issue on POWER9


The issue in tools/testing/selftests/powerpc/mm/tlbie_test.c in 
end_verification_log() is as follows:

static inline void end_verification_log(unsigned int tid, unsigned 
nr_anamolies)
{
         FILE *f = fp[tid];
         char logfile[30];
         char path[LOGDIR_NAME_SIZE + 30];
         char separator[] = "/";

         fclose(f);

         if (nr_anamolies == 0) {
                 remove(path);
                 return;
         }
	.... etc


in the case where nr_anamolies is zero the remove(path) call is using an 
uninitialized path, this potentially could contain uninitialized garbage 
on the stack (and if one is unlucky enough it may be a valid filename 
that one does not want to be removed).

Not sure what the original intention was, but this code looks incorrect 
to me.

Colin