3.2.51-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Chen Gang <gang.chen@xxxxxxxxxxx> commit 057d6332b24a4497c55a761c83c823eed9e3f23b upstream. For cifs_set_cifscreds() in "fs/cifs/connect.c", 'desc' buffer length is 'CIFSCREDS_DESC_SIZE' (56 is less than 256), and 'ses->domainName' length may be "255 + '\0'". The related sprintf() may cause memory overflow, so need extend related buffer enough to hold all things. It is also necessary to be sure of 'ses->domainName' must be less than 256, and define the related macro instead of hard code number '256'. Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx> Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx> Reviewed-by: Scott Lovenberg <scott.lovenberg@xxxxxxxxx> Signed-off-by: Steve French <smfrench@xxxxxxxxx> [bwh: Backported to 3.2: - Adjust context in sess.c - Drop inapplicable changes to connect.c] Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -369,7 +369,7 @@ find_domain_name(struct cifs_ses *ses, c if (blobptr + attrsize > blobend) break; if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { - if (!attrsize) + if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) break; if (!ses->domainName) { ses->domainName = --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -38,6 +38,7 @@ #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1) #define MAX_SERVER_SIZE 15 #define MAX_SHARE_SIZE 80 +#define CIFS_MAX_DOMAINNAME_LEN 256 /* max domain name length */ #define MAX_USERNAME_SIZE 256 /* reasonable maximum for current servers */ #define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */ --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -198,7 +198,7 @@ static void unicode_domain_string(char * bytes_ret = 0; } else bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName, - 256, nls_cp); + CIFS_MAX_DOMAINNAME_LEN, nls_cp); bcc_ptr += 2 * bytes_ret; bcc_ptr += 2; /* account for null terminator */ @@ -256,8 +256,8 @@ static void ascii_ssetup_strings(char ** /* copy domain */ if (ses->domainName != NULL) { - strncpy(bcc_ptr, ses->domainName, 256); - bcc_ptr += strnlen(ses->domainName, 256); + strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); + bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); } /* else we will send a null domain name so the server will default to its own domain */ *bcc_ptr = 0; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html