diff options
| author | Jeff Layton <jlayton@redhat.com> | 2013-05-24 07:40:04 -0400 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2013-05-24 13:08:19 -0500 |
| commit | 166faf21bd14bc5c5295a44874bf7f3930c30b20 (patch) | |
| tree | 02daebf2e219f1737dcd7fb979d277c519974295 | |
| parent | 62106e96279f66c52e2123782f9420af9dbe8cbe (diff) | |
cifs: fix potential buffer overrun when composing a new options string
Consider the case where we have a very short ip= string in the original
mount options, and when we chase a referral we end up with a very long
IPv6 address. Be sure to allow for that possibility when estimating the
size of the string to allocate.
Cc: <stable@vger.kernel.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
| -rw-r--r-- | fs/cifs/cifs_dfs_ref.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c index 8e33ec65847..8e5a1817496 100644 --- a/fs/cifs/cifs_dfs_ref.c +++ b/fs/cifs/cifs_dfs_ref.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/vfs.h> #include <linux/fs.h> +#include <linux/inet.h> #include "cifsglob.h" #include "cifsproto.h" #include "cifsfs.h" @@ -150,7 +151,8 @@ char *cifs_compose_mount_options(const char *sb_mountdata, * assuming that we have 'unc=' and 'ip=' in * the original sb_mountdata */ - md_len = strlen(sb_mountdata) + rc + strlen(ref->node_name) + 12; + md_len = strlen(sb_mountdata) + rc + strlen(ref->node_name) + 12 + + INET6_ADDRSTRLEN; mountdata = kzalloc(md_len+1, GFP_KERNEL); if (mountdata == NULL) { rc = -ENOMEM; |