AUDIT: Round up audit skb expansion to AUDIT_BUFSIZ.

Otherwise, we will be repeatedly reallocating, even if we're only
adding a few bytes at a time. Pointed out by Steve Grubb.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/kernel/audit.c b/kernel/audit.c
index 060b554..1871645 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -670,7 +670,7 @@ static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
                /* The printk buffer is 1024 bytes long, so if we get
                 * here and AUDIT_BUFSIZ is at least 1024, then we can
                 * log everything that printk could have logged. */
-               avail = audit_expand(ab, 1+len-avail);
+               avail = audit_expand(ab, max_t(AUDIT_BUFSIZ, 1+len-avail));
                if (!avail)
                        goto out;
                len = vsnprintf(skb->tail, avail, fmt, args2);