From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: kernel-janitors@vger.kernel.org, xen-devel@lists.xensource.com,
virtualization@lists.linux-foundation.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [patch 1/2] xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()
Date: Fri, 04 Nov 2011 18:24:08 +0000 [thread overview]
Message-ID: <20111104182408.GD5796@elgon.mountain> (raw)
On 32 bit systems a high value of op.count could lead to an integer
overflow in the kzalloc() and gref_ids would be smaller than
expected. If the you triggered another integer overflow in
"if (gref_size + op.count > limit)" then you'd probably get memory
corruption inside add_grefs().
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index f6832f4..23c60cf 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -280,7 +280,7 @@ static long gntalloc_ioctl_alloc(struct gntalloc_file_private_data *priv,
goto out;
}
- gref_ids = kzalloc(sizeof(gref_ids[0]) * op.count, GFP_TEMPORARY);
+ gref_ids = kcalloc(op.count, sizeof(gref_ids[0]), GFP_TEMPORARY);
if (!gref_ids) {
rc = -ENOMEM;
goto out;
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: kernel-janitors@vger.kernel.org, xen-devel@lists.xensource.com,
virtualization@lists.linux-foundation.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [patch 1/2] xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()
Date: Fri, 4 Nov 2011 21:24:08 +0300 [thread overview]
Message-ID: <20111104182408.GD5796@elgon.mountain> (raw)
On 32 bit systems a high value of op.count could lead to an integer
overflow in the kzalloc() and gref_ids would be smaller than
expected. If the you triggered another integer overflow in
"if (gref_size + op.count > limit)" then you'd probably get memory
corruption inside add_grefs().
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index f6832f4..23c60cf 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -280,7 +280,7 @@ static long gntalloc_ioctl_alloc(struct gntalloc_file_private_data *priv,
goto out;
}
- gref_ids = kzalloc(sizeof(gref_ids[0]) * op.count, GFP_TEMPORARY);
+ gref_ids = kcalloc(op.count, sizeof(gref_ids[0]), GFP_TEMPORARY);
if (!gref_ids) {
rc = -ENOMEM;
goto out;
next reply other threads:[~2011-11-04 18:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-04 18:24 Dan Carpenter [this message]
2011-11-04 18:24 ` [patch 1/2] xen-gntalloc: integer overflow in gntalloc_ioctl_alloc() Dan Carpenter
2011-11-04 18:35 ` [patch 1/2] xen-gntalloc: integer overflow in Konrad Rzeszutek Wilk
2011-11-04 18:35 ` [patch 1/2] xen-gntalloc: integer overflow in gntalloc_ioctl_alloc() Konrad Rzeszutek Wilk
-- strict thread matches above, loose matches on Subject: below --
2011-11-04 18:24 Dan Carpenter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111104182408.GD5796@elgon.mountain \
--to=dan.carpenter@oracle.com \
--cc=jeremy.fitzhardinge@citrix.com \
--cc=kernel-janitors@vger.kernel.org \
--cc=konrad.wilk@oracle.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=xen-devel@lists.xensource.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.