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lib: fix potential segfault in LUKS2_token_buffer_free

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The value of h may be NULL. Check it vefore visiting its
memeber to avoid segfault.

Signed-off-by: Lixiaokeng <lixiaokeng@huawei.com>
Signed-off-by: Linfeilong <linfeilong@huawei.com>
This commit is contained in:
lixiaokeng
2020-11-09 09:45:42 +08:00
committed by Milan Broz
parent 0d90efac88
commit 78f33946f1
1 changed files with 1 additions and 1 deletions
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2
lib/luks2/luks2_token.c
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@@ -329,7 +329,7 @@ static void LUKS2_token_buffer_free(struct crypt_device *cd,
{ {
const crypt_token_handler *h = LUKS2_token_handler(cd, token); const crypt_token_handler *h = LUKS2_token_handler(cd, token);
if (h->buffer_free) if (h && h->buffer_free)
h->buffer_free(buffer, buffer_len); h->buffer_free(buffer, buffer_len);
else { else {
crypt_safe_memzero(buffer, buffer_len); crypt_safe_memzero(buffer, buffer_len);