Patch "ipr: Fix out-of-bounds null overwrite" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

ipr: Fix out-of-bounds null overwrite

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ipr-fix-out-of-bounds-null-overwrite.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Insu Yun <[email protected]>
Date: Wed, 6 Jan 2016 12:44:01 -0500
Subject: ipr: Fix out-of-bounds null overwrite

From: Insu Yun <[email protected]>

commit d63c7dd5bcb9441af0526d370c43a65ca2c980d9 upstream.

Return value of snprintf is not bound by size value, 2nd argument.
(https://www.kernel.org/doc/htmldocs/kernel-api/API-snprintf.html).
Return value is number of printed chars, can be larger than 2nd argument. Therefore, it can write null byte out of bounds ofbuffer. Since snprintf puts null, it does not need to put additional null byte.

---
 drivers/scsi/ipr.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

@@ -4003,13 +4003,12 @@ static ssize_t ipr_store_update_fw(struc
 	struct ipr_sglist *sglist;
 	char fname[100];
 	char *src;
-	int len, result, dnld_size;
+	int result, dnld_size;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 
-	len = snprintf(fname, 99, "%s", buf);
-	fname[len-1] = '\0';
+	snprintf(fname, sizeof(fname), "%s", buf);
 
 	if (request_firmware(&fw_entry, fname, &ioa_cfg->pdev->dev)) {
 		dev_err(&ioa_cfg->pdev->dev, "Firmware file %s not found\n", fname);

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/ipr-fix-regression-when-loading-firmware.patch queue-4.4/ipr-fix-out-of-bounds-null-overwrite.patch