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audit/stable-4.18 PR 20180731

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Merge tag 'audit-pr-20180731' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

Pull audit fix from Paul Moore:
 "A single small audit fix to guard against memory allocation failures
  when logging information about a kernel module load.

  It's small, easy to understand, and self-contained; while nothing is
  zero risk, this should be pretty low"

* tag 'audit-pr-20180731' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
  audit: fix potential null dereference 'context->module.name'
This commit is contained in:
Linus Torvalds 2018-07-31 13:17:46 -07:00
commit 37b71411b7
1 changed files with 9 additions and 4 deletions
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13
kernel/auditsc.c
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@ -1279,8 +1279,12 @@ static void show_special(struct audit_context *context, int *call_panic)
break;
case AUDIT_KERN_MODULE:
audit_log_format(ab, "name=");
audit_log_untrustedstring(ab, context->module.name);
kfree(context->module.name);
if (context->module.name) {
audit_log_untrustedstring(ab, context->module.name);
kfree(context->module.name);
} else
audit_log_format(ab, "(null)");
break;
}
audit_log_end(ab);
@ -2411,8 +2415,9 @@ void __audit_log_kern_module(char *name)
{
struct audit_context *context = audit_context();
context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
strcpy(context->module.name, name);
context->module.name = kstrdup(name, GFP_KERNEL);
if (!context->module.name)
audit_log_lost("out of memory in __audit_log_kern_module");
context->type = AUDIT_KERN_MODULE;
}