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Code Issues Releases Wiki Activity

ksmbd: fix memory leak in ksmbd_vfs_get_sd_xattr()

Browse source 
Add free acl.sd_buf and n.data on error handling in
ksmbd_vfs_get_sd_xattr().

Reported-by: Coverity Scan <scan-admin@coverity.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2021-07-13 17:12:41 +09:00
parent f19b3967fb
commit 78ad2c277a
1 changed files with 53 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

103
fs/ksmbd/vfs.c
View file

@ -1498,63 +1498,66 @@ int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
{
int rc;
struct ndr n;
struct inode *inode = d_inode(dentry);
struct ndr acl_ndr = {0};
struct xattr_ntacl acl;
struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
__u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
if (rc > 0) {
struct inode *inode = d_inode(dentry);
struct ndr acl_ndr = {0};
struct xattr_ntacl acl;
struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
__u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
if (rc <= 0)
return rc;
n.length = rc;
rc = ndr_decode_v4_ntacl(&n, &acl);
if (rc)
return rc;
n.length = rc;
rc = ndr_decode_v4_ntacl(&n, &acl);
if (rc)
goto free_n_data;
smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
ACL_TYPE_ACCESS);
if (S_ISDIR(inode->i_mode))
def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns,
inode,
ACL_TYPE_DEFAULT);
smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
ACL_TYPE_ACCESS);
if (S_ISDIR(inode->i_mode))
def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
ACL_TYPE_DEFAULT);
rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
smb_acl, def_smb_acl);
if (rc) {
pr_err("failed to encode ndr to posix acl\n");
goto out;
}
rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
cmp_hash);
if (rc) {
pr_err("failed to generate hash for ndr acl\n");
goto out;
}
if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
pr_err("hash value diff\n");
rc = -EINVAL;
goto out;
}
*pntsd = acl.sd_buf;
(*pntsd)->osidoffset =
cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - NDR_NTSD_OFFSETOF);
(*pntsd)->gsidoffset =
cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - NDR_NTSD_OFFSETOF);
(*pntsd)->dacloffset =
cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - NDR_NTSD_OFFSETOF);
rc = acl.sd_size;
out:
kfree(n.data);
kfree(acl_ndr.data);
kfree(smb_acl);
kfree(def_smb_acl);
rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
def_smb_acl);
if (rc) {
pr_err("failed to encode ndr to posix acl\n");
goto out_free;
}
rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
if (rc) {
pr_err("failed to generate hash for ndr acl\n");
goto out_free;
}
if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
pr_err("hash value diff\n");
rc = -EINVAL;
goto out_free;
}
*pntsd = acl.sd_buf;
(*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
NDR_NTSD_OFFSETOF);
(*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
NDR_NTSD_OFFSETOF);
(*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
NDR_NTSD_OFFSETOF);
rc = acl.sd_size;
out_free:
kfree(acl_ndr.data);
kfree(smb_acl);
kfree(def_smb_acl);
if (rc < 0) {
kfree(acl.sd_buf);
*pntsd = NULL;
}
free_n_data:
kfree(n.data);
return rc;
}