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selinux: fix double free

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Clang's static analysis tool reports these double free memory errors.

security/selinux/ss/services.c:2987:4: warning: Attempt to free released memory [unix.Malloc]
                        kfree(bnames[i]);
                        ^~~~~~~~~~~~~~~~
security/selinux/ss/services.c:2990:2: warning: Attempt to free released memory [unix.Malloc]
        kfree(bvalues);
        ^~~~~~~~~~~~~~

So improve the security_get_bools error handling by freeing these variables
and setting their return pointers to NULL and the return len to 0

Cc: stable@vger.kernel.org
Signed-off-by: Tom Rix <trix@redhat.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Tom Rix 2020-06-10 14:57:13 -07:00 • committed by Paul Moore
parent fe5a90b8c1
commit 65de50969a
1 changed files with 4 additions and 0 deletions
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4
security/selinux/ss/services.c
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@ -2888,8 +2888,12 @@ err:
if (*names) { if (*names) {
for (i = 0; i < *len; i++) for (i = 0; i < *len; i++)
kfree((*names)[i]); kfree((*names)[i]);
kfree(*names);
} }
kfree(*values); kfree(*values);
*len = 0;
*names = NULL;
*values = NULL;
goto out; goto out;
} }