6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Fedor Pchelkin <pchelkin@xxxxxxxxx>
commit 8cf9bedfc3c47d24bb0de386f808f925dc52863e upstream.
The ppace array is not freed if one of the init_acl_state() calls inside
parse_dacl() fails. At the moment the function may fail only due to the
memory allocation errors so it's highly unlikely in this case but
nevertheless a fix is needed.
Move ppace allocation after the init_acl_state() calls with proper error
handling.
Found by Linux Verification Center (linuxtesting.org).
Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/smb/server/smbacl.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/fs/smb/server/smbacl.c
+++ b/fs/smb/server/smbacl.c
@@ -401,10 +401,6 @@ static void parse_dacl(struct mnt_idmap
if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))
return;
- ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
- if (!ppace)
- return;
-
ret = init_acl_state(&acl_state, num_aces);
if (ret)
return;
@@ -413,6 +409,13 @@ static void parse_dacl(struct mnt_idmap
free_acl_state(&acl_state);
return;
}
+
+ ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
+ if (!ppace) {
+ free_acl_state(&default_acl_state);
+ free_acl_state(&acl_state);
+ return;
+ }
/*
* reset rwx permissions for user/group/other.
