From: Anton Blanchard <anton@samba.org>
To: David Howells <dhowells@redhat.com>
Cc: linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: RxRPC: Allocate tokens with kzalloc to avoid oops in rxrpc_destroy
Date: Tue, 15 Feb 2011 17:16:55 +1100 [thread overview]
Message-ID: <20110215171655.11538899@kryten> (raw)
With slab poisoning enabled, I see the following oops:
Unable to handle kernel paging request for data at address 0x6b6b6b6b6b6b6b73
...
NIP [c0000000006bc61c] .rxrpc_destroy+0x44/0x104
LR [c0000000006bc618] .rxrpc_destroy+0x40/0x104
Call Trace:
[c0000000feb2bc00] [c0000000006bc618] .rxrpc_destroy+0x40/0x104 (unreliable)
[c0000000feb2bc90] [c000000000349b2c] .key_cleanup+0x1a8/0x20c
[c0000000feb2bd40] [c0000000000a2920] .process_one_work+0x2f4/0x4d0
[c0000000feb2be00] [c0000000000a2d50] .worker_thread+0x254/0x468
[c0000000feb2bec0] [c0000000000a868c] .kthread+0xbc/0xc8
[c0000000feb2bf90] [c000000000020e00] .kernel_thread+0x54/0x70
We aren't initialising token->next, but the code in destroy_context relies
on the list being NULL terminated. Use kzalloc to zero out all the fields.
Signed-off-by: Anton Blanchard <anton@samba.org>
---
Index: linux-2.6/net/rxrpc/ar-key.c
===================================================================
--- linux-2.6.orig/net/rxrpc/ar-key.c 2011-02-15 17:06:15.254289163 +1100
+++ linux-2.6/net/rxrpc/ar-key.c 2011-02-15 17:07:37.032349273 +1100
@@ -89,11 +89,11 @@ static int rxrpc_instantiate_xdr_rxkad(s
return ret;
plen -= sizeof(*token);
- token = kmalloc(sizeof(*token), GFP_KERNEL);
+ token = kzalloc(sizeof(*token), GFP_KERNEL);
if (!token)
return -ENOMEM;
- token->kad = kmalloc(plen, GFP_KERNEL);
+ token->kad = kzalloc(plen, GFP_KERNEL);
if (!token->kad) {
kfree(token);
return -ENOMEM;
@@ -731,10 +731,10 @@ static int rxrpc_instantiate(struct key
goto error;
ret = -ENOMEM;
- token = kmalloc(sizeof(*token), GFP_KERNEL);
+ token = kzalloc(sizeof(*token), GFP_KERNEL);
if (!token)
goto error;
- token->kad = kmalloc(plen, GFP_KERNEL);
+ token->kad = kzalloc(plen, GFP_KERNEL);
if (!token->kad)
goto error_free;
reply other threads:[~2011-02-15 6:17 UTC|newest]
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