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ksmbd: free ppace array on error in parse_dacl 

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: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Fedor Pchelkin 2024-01-09 17:14:44 +03:00 committed by Steve French
parent 3fc74c65b3
commit 8cf9bedfc3
1 changed files with 7 additions and 4 deletions
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11
fs/smb/server/smbacl.c
View File

@ -401,10 +401,6 @@ static void parse_dacl(struct mnt_idmap *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;
@ -414,6 +410,13 @@ static void parse_dacl(struct mnt_idmap *idmap,
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,