[PATCH] cifs: don't send invalid setxattr requests

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[PATCH] cifs: don't send invalid setxattr requests

Samba - samba-technical mailing list
There is a static checker warning here because we're taking a "size"
from the user which is in the 1-XATTR_SIZE_MAX range and we're assuming
it's large enough to hold a sizeof(struct cifs_ntsd).  This doesn't
cause a buffer overflow or anything, we just end up sending an invalid
sized command to the server.  The server checks for that in
CIFSSMBGetCIFSACL() and rejects it.

Signed-off-by: Dan Carpenter <[hidden email]>
---
Not tested.  Please review this one carefully.

diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index de50e749ff05..70bdce5add24 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -93,6 +93,10 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
 
  if (!value)
  goto out;
+ if (size < sizeof(struct cifs_ntsd)) {
+ rc = -EINVAL;
+ goto out;
+ }
  pacl = kmalloc(size, GFP_KERNEL);
  if (!pacl) {
  rc = -ENOMEM;

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