linux-kernel - Re: [PATCH][Resend] SCSI, target, loopback: Fix memory leak in tcm_loop_make_scsi

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Date:	Sun, 17 Jul 2011 13:59:34 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	Jesper Juhl <jj@...osbits.net>,
	James Bottomley <jbottomley@...allels.com>,
	Christoph Hellwig <hch@....de>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	target-devel <target-devel@...r.kernel.org>
Subject: Re: [PATCH][Resend] SCSI, target, loopback: Fix memory leak in
	tcm_loop_make_scsi_hba()

On Tue, 2011-06-28 at 09:22 +0300, Dan Carpenter wrote:
> On Tue, Jun 28, 2011 at 12:30:17AM +0200, Jesper Juhl wrote:
> > 
> > You mean like this - right?
> 
> Yeah.
> 
> Acked-by: Dan Carpenter <error27@...il.com>
> 

Hi Guys,

Following up on some items that where missed over my summer holiday.

Committed and pushed this patch into lio-core-2.6.git/master recently as
the following.

Thanks JesperJ and DanC!

--nab

--------------------------------------------------------------------

commit 90e104e39aa30437a8ac4572e4499e7c3a914458
Author: Jesper Juhl <jj@...osbits.net>
Date:   Tue Jun 28 00:30:17 2011 +0200

    loopback: Fix memory leak in tcm_loop_make_scsi_hba()
    
    There is a memory leak in tcm_loop_make_scsi_hba().
    
    If all the strstr() calls return NULL and we end up at return ERR_PTR(-EINVAL);
    then we'll be leaking the memory previously allocated to tl_hba as
    that variable goes out of scope.
    
    This patch should fix the leak.
    
    Signed-off-by: Jesper Juhl <jj@...osbits.net>
    Signed-off-by: Dan Carpenter <error27@...il.com>
    Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 5075e9b..f603698 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -1288,22 +1288,21 @@ struct se_wwn *tcm_loop_make_scsi_hba(
                goto check_len;
        }
        ptr = strstr(name, "iqn.");
-       if (ptr) {
-               tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
-               goto check_len;
+       if (!ptr) {
+               printk(KERN_ERR "Unable to locate prefix for emulated Target "
+                               "Port: %s\n", name);
+               ret = -EINVAL;
+               goto out;
        }
-
-       printk(KERN_ERR "Unable to locate prefix for emulated Target Port:"
-                       " %s\n", name);
-       return ERR_PTR(-EINVAL);
+       tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
 
 check_len:
        if (strlen(name) >= TL_WWN_ADDR_LEN) {
                printk(KERN_ERR "Emulated NAA %s Address: %s, exceeds"
                        " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
                        TL_WWN_ADDR_LEN);
-               kfree(tl_hba);
-               return ERR_PTR(-EINVAL);
+               ret = -EINVAL;
+               goto out;
        }
        snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);





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