Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 25/33] cifs: fix potential buffer overrun when composing a new options string | Date | Wed, 5 Jun 2013 13:53:03 -0700 |
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3.0-stable review patch. If anyone has any objections, please let me know.
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From: Jeff Layton <jlayton@redhat.com>
commit 166faf21bd14bc5c5295a44874bf7f3930c30b20 upstream.
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.
Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/cifs/cifs_dfs_ref.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- 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" @@ -149,7 +150,8 @@ char *cifs_compose_mount_options(const c * 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;
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