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smb3: fix possible access to uninitialized pointer to DACL 

dacl_ptr can be null so we must check for it everywhere it is
used in build_sec_desc.

Addresses-Coverity: 1475598 ("Explicit null dereference")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2021-06-22 17:54:50 -05:00
parent 0917310b98
commit a5628263a9
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/cifsacl.c
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@ -1294,7 +1294,7 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset);
ndacl_ptr->revision =
dacloffset ? dacl_ptr->revision : cpu_to_le16(ACL_REVISION);
ndacl_ptr->num_aces = dacl_ptr->num_aces;
ndacl_ptr->num_aces = dacl_ptr ? dacl_ptr->num_aces : 0;
if (uid_valid(uid)) { /* chown */
uid_t id;