linux-kernel - [PATCH] firmware_class: Avoid pending list corruption

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1485348342-11536-1-git-send-email-kimran@codeaurora.org>
Date:   Wed, 25 Jan 2017 18:15:42 +0530
From:   Imran Khan <kimran@...eaurora.org>
To:     ming.lei@...onical.com
Cc:     mcgrof@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Imran Khan <kimran@...eaurora.org>
Subject: [PATCH] firmware_class: Avoid pending list corruption

Remove firmware buffer from pending list when it is freed.
Once the buffer is free kmalloc can allocate the same slab
object for some other user but as the buffer is still there
in the pending list, we end up with multiple users of the
same slab object using it in different contexts.

Signed-off-by: Imran Khan <kimran@...eaurora.org>
---
 drivers/base/firmware_class.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 4497d26..d09c1aa 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -339,6 +339,9 @@ static void __fw_free_buf(struct kref *ref)
 		 (unsigned int)buf->size);
 
 	list_del(&buf->list);
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+	list_del(&buf->pending_list);
+#endif
 	spin_unlock(&fwc->lock);
 
 #ifdef CONFIG_FW_LOADER_USER_HELPER
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project