1 files changed, 25 insertions, 14 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 12cf72dd0c4..c761935eab8 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2750,21 +2750,21 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
 
 /*
  * When the server supports very large writes via POSIX extensions, we can
- * allow up to 2^24 - PAGE_CACHE_SIZE.
+ * allow up to 2^24-1, minus the size of a WRITE_AND_X header, not including
+ * the RFC1001 length.
  *
  * Note that this might make for "interesting" allocation problems during
- * writeback however (as we have to allocate an array of pointers for the
- * pages). A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
+ * writeback however as we have to allocate an array of pointers for the
+ * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
  */
-#define CIFS_MAX_WSIZE ((1<<24) - PAGE_CACHE_SIZE)
+#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
 
 /*
- * When the server doesn't allow large posix writes, default to a wsize of
- * 128k - PAGE_CACHE_SIZE -- one page less than the largest frame size
- * described in RFC1001. This allows space for the header without going over
- * that by default.
+ * When the server doesn't allow large posix writes, only allow a wsize of
+ * 128k minus the size of the WRITE_AND_X header. That allows for a write up
+ * to the maximum size described by RFC1002.
  */
-#define CIFS_MAX_RFC1001_WSIZE (128 * 1024 - PAGE_CACHE_SIZE)
+#define CIFS_MAX_RFC1002_WSIZE (128 * 1024 - sizeof(WRITE_REQ) + 4)
 
 /*
  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
@@ -2783,11 +2783,18 @@ cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
 
         /* can server support 24-bit write sizes? (via UNIX extensions) */
         if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
-                wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1001_WSIZE);
+                wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
 
-        /* no CAP_LARGE_WRITE_X? Limit it to 16 bits */
-        if (!(server->capabilities & CAP_LARGE_WRITE_X))
-                wsize = min_t(unsigned int, wsize, USHRT_MAX);
+        /*
+         * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
+         * Limit it to max buffer offered by the server, minus the size of the
+         * WRITEX header, not including the 4 byte RFC1001 length.
+         */
+        if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
+            (!(server->capabilities & CAP_UNIX) &&
+             (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
+                wsize = min_t(unsigned int, wsize,
+                                server->maxBuf - sizeof(WRITE_REQ) + 4);
 
         /* hard limit of CIFS_MAX_WSIZE */
         wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
@@ -2937,7 +2944,11 @@ int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,
 
         if (volume_info->nullauth) {
                 cFYI(1, "null user");
-                volume_info->username = "";
+                volume_info->username = kzalloc(1, GFP_KERNEL);
+                if (volume_info->username == NULL) {
+                        rc = -ENOMEM;
+                        goto out;
+                }
         } else if (volume_info->username) {
                 /* BB fixme parse for domain name here */
                 cFYI(1, "Username: %s", volume_info->username);