From: Fedor Pchelkin <pchelkin@xxxxxxxxx>
[ Upstream commit 8cf9bedfc3c47d24bb0de386f808f925dc52863e ]
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>
---
fs/ksmbd/smbacl.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c
index 9ace5027684d..3a6c0abdb035 100644
--- a/fs/ksmbd/smbacl.c
+++ b/fs/ksmbd/smbacl.c
@@ -399,10 +399,6 @@ static void parse_dacl(struct user_namespace *user_ns,
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;
@@ -412,6 +408,13 @@ static void parse_dacl(struct user_namespace *user_ns,
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.
* Also, if num_aces is 0 i.e. DACL has no ACEs,
--
2.25.1
