[PATCH -next] EVM: fix return value check in evm_write_xattrs()

[PATCH -next] EVM: fix return value check in evm_write_xattrs()

[Wei Yongjun]

In case of error, the function audit_log_start() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.

Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
---
 security/integrity/evm/evm_secfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
index 637eb99..77de71b 100644
--- a/security/integrity/evm/evm_secfs.c
+++ b/security/integrity/evm/evm_secfs.c
@@ -193,8 +193,8 @@ static ssize_t evm_write_xattrs(struct file *file, const char __user *buf,
 		return -E2BIG;
 
 	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_EVM_XATTR);
-	if (IS_ERR(ab))
-		return PTR_ERR(ab);
+	if (!ab)
+		return -ENOMEM;
 
 	xattr = kmalloc(sizeof(struct xattr_list), GFP_KERNEL);
 	if (!xattr) {

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[PATCH -next] EVM: fix return value check in evm_write_xattrs()

[Serge E. Hallyn]

Quoting Wei Yongjun (weiyongjun1 at huawei.com):
> In case of error, the function audit_log_start() returns NULL pointer
> not ERR_PTR(). The IS_ERR() test in the return value check should be
> replaced with NULL test.
> 
> Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>

Acked-by: Serge Hallyn <serge@hallyn.com>

> ---
>  security/integrity/evm/evm_secfs.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
> index 637eb99..77de71b 100644
> --- a/security/integrity/evm/evm_secfs.c
> +++ b/security/integrity/evm/evm_secfs.c
> @@ -193,8 +193,8 @@ static ssize_t evm_write_xattrs(struct file *file, const char __user *buf,
>  		return -E2BIG;
>  
>  	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_EVM_XATTR);
> -	if (IS_ERR(ab))
> -		return PTR_ERR(ab);
> +	if (!ab)
> +		return -ENOMEM;
>  
>  	xattr = kmalloc(sizeof(struct xattr_list), GFP_KERNEL);
>  	if (!xattr) {
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[PATCH -next] EVM: fix return value check in evm_write_xattrs()

[Mimi Zohar]

On Wed, 2018-07-11 at 10:15 -0500, Serge E. Hallyn wrote:
> Quoting Wei Yongjun (weiyongjun1 at huawei.com):
> > In case of error, the function audit_log_start() returns NULL pointer
> > not ERR_PTR(). The IS_ERR() test in the return value check should be
> > replaced with NULL test.
> > 
> > Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
> > Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
> 
> Acked-by: Serge Hallyn <serge@hallyn.com>

Thanks, this patch is now queued in the next-integrity branch of the
linux-integrity tree.

Mimi

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