* [PATCH] cifs: fix potential overflow in cifs_compose_mount_options
@ 2016-02-01 16:34 Insu Yun
2016-02-11 0:14 ` Steve French
0 siblings, 1 reply; 2+ messages in thread
From: Insu Yun @ 2016-02-01 16:34 UTC (permalink / raw)
To: sfrench, linux-cifs, samba-technical, linux-kernel
Cc: taesoo, yeongjin.jang, insu, changwoo, Insu Yun
In worst case, "ip=" + sb_mountdata + ipv6 can be copied into mountdata.
Therefore, for safe, it is better to add more size when allocating memory.
Signed-off-by: Insu Yun <wuninsu@gmail.com>
---
fs/cifs/cifs_dfs_ref.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 7dc886c..e956cba 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -175,7 +175,7 @@ char *cifs_compose_mount_options(const char *sb_mountdata,
* string to the length of the original string to allow for worst case.
*/
md_len = strlen(sb_mountdata) + INET6_ADDRSTRLEN;
- mountdata = kzalloc(md_len + 1, GFP_KERNEL);
+ mountdata = kzalloc(md_len + sizeof("ip=") + 1, GFP_KERNEL);
if (mountdata == NULL) {
rc = -ENOMEM;
goto compose_mount_options_err;
--
1.9.1
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] cifs: fix potential overflow in cifs_compose_mount_options
2016-02-01 16:34 [PATCH] cifs: fix potential overflow in cifs_compose_mount_options Insu Yun
@ 2016-02-11 0:14 ` Steve French
0 siblings, 0 replies; 2+ messages in thread
From: Steve French @ 2016-02-11 0:14 UTC (permalink / raw)
To: Insu Yun
Cc: Steve French, linux-cifs, samba-technical, LKML, taesoo,
yeongjin.jang, insu, changwoo
On Mon, Feb 1, 2016 at 10:34 AM, Insu Yun <wuninsu@gmail.com> wrote:
> In worst case, "ip=" + sb_mountdata + ipv6 can be copied into mountdata.
> Therefore, for safe, it is better to add more size when allocating memory.
>
> Signed-off-by: Insu Yun <wuninsu@gmail.com>
> ---
> fs/cifs/cifs_dfs_ref.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
> index 7dc886c..e956cba 100644
> --- a/fs/cifs/cifs_dfs_ref.c
> +++ b/fs/cifs/cifs_dfs_ref.c
> @@ -175,7 +175,7 @@ char *cifs_compose_mount_options(const char *sb_mountdata,
> * string to the length of the original string to allow for worst case.
> */
> md_len = strlen(sb_mountdata) + INET6_ADDRSTRLEN;
> - mountdata = kzalloc(md_len + 1, GFP_KERNEL);
> + mountdata = kzalloc(md_len + sizeof("ip=") + 1, GFP_KERNEL);
> if (mountdata == NULL) {
> rc = -ENOMEM;
> goto compose_mount_options_err;
Not likely to be reproducible in practice (since ip= is already in the
sb_mountdata) but in case mount.cifs was missing and ip= was missing from
the original mount string, might as well add it.
Merged into cifs-2.6.git
--
Thanks,
Steve
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-02-01 16:34 [PATCH] cifs: fix potential overflow in cifs_compose_mount_options Insu Yun
2016-02-11 0:14 ` Steve French
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