From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 29 Jan 2013 03:34:43 +0000 (-0500)
Subject: staging/fwserial: add diagnostic for buffer overflow
X-Git-Tag: firefly_0821_release~3680^2~1080^2~213
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ef34dd184d58824f1cde7402afa8ba2a957029d9;p=firefly-linux-kernel-4.4.55.git

staging/fwserial: add diagnostic for buffer overflow

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index 258ac35fb5af..fe9a68854452 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -577,8 +577,11 @@ static int fwtty_buffer_rx(struct fwtty_port *port, unsigned char *d, size_t n)
 	struct buffered_rx *buf;
 	size_t size = (n + sizeof(struct buffered_rx) + 0xFF) & ~0xFF;
 
-	if (port->buffered + n > HIGH_WATERMARK)
+	if (port->buffered + n > HIGH_WATERMARK) {
+		fwtty_err_ratelimited(port, "overflowed rx buffer: buffered: %d new: %ld wtrmk: %d",
+				      port->buffered, n, HIGH_WATERMARK);
 		return 0;
+	}
 	buf = kmalloc(size, GFP_ATOMIC);
 	if (!buf)
 		return 0;