Patch "staging: ccree: NULLify backup_info when unused" has been added to the 4.15-stable tree

Patch "staging: ccree: NULLify backup_info when unused" has been added to the 4.15-stable tree

[gregkh]

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

    staging: ccree: NULLify backup_info when unused

to the 4.15-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:
     staging-ccree-nullify-backup_info-when-unused.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 46df8824982e4fb0198776078d4a8c3e2d531464 Mon Sep 17 00:00:00 2001
From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Sun, 3 Dec 2017 13:58:19 +0000
Subject: staging: ccree: NULLify backup_info when unused

From: Gilad Ben-Yossef <gilad@benyossef.com>

commit 46df8824982e4fb0198776078d4a8c3e2d531464 upstream.

backup_info field is only allocated for decrypt code path.
The field was not nullified when not used causing a kfree
in an error handling path to attempt to free random
addresses as uncovered in stress testing.

Fixes: 737aed947f9b ("staging: ccree: save ciphertext for CTS IV")
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/ccree/ssi_cipher.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/staging/ccree/ssi_cipher.c
+++ b/drivers/staging/ccree/ssi_cipher.c
@@ -908,6 +908,7 @@ static int ssi_ablkcipher_decrypt(struct
 	scatterwalk_map_and_copy(req_ctx->backup_info, req->src,
 				 (req->nbytes - ivsize), ivsize, 0);
 	req_ctx->is_giv = false;
+	req_ctx->backup_info = NULL;
 
 	return ssi_blkcipher_process(tfm, req_ctx, req->dst, req->src, req->nbytes, req->info, ivsize, (void *)req, DRV_CRYPTO_DIRECTION_DECRYPT);
 }


Patches currently in stable-queue which might be from gilad@benyossef.com are

queue-4.15/staging-ccree-fix-fips-event-irq-handling-build.patch
queue-4.15/staging-ccree-nullify-backup_info-when-unused.patch