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efi_loader: efi_variable_parse_signature() returns NULL on error

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efi_variable_parse_signature() returns NULL on error, so IS_ERR()
is an incorrect check.  The goto err leads to pkcs7_free_message(),
which works fine on a NULL ptr.

Signed-off-by: Patrick Wildt <patrick@blueri.se>
Reviewed-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
Patrick Wildt 2020-05-07 02:13:18 +02:00 • committed by Heinrich Schuchardt
parent 42a426e027
commit 9ad15227bb
1 changed files with 1 additions and 2 deletions
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3
lib/efi_loader/efi_variable.c
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@ -524,9 +524,8 @@ static efi_status_t efi_variable_authenticate(u16 *variable,
var_sig = efi_variable_parse_signature(auth->auth_info.cert_data,
auth->auth_info.hdr.dwLength
- sizeof(auth->auth_info));
if (IS_ERR(var_sig)) {
if (!var_sig) {
debug("Parsing variable's signature failed\n");
var_sig = NULL;
goto err;
}