[PATCH v1 1/1] xlog: fix out of static memory on metadata load
Vladimir Davydov
vdavydov.dev at gmail.com
Fri Aug 17 13:14:10 MSK 2018
On Wed, Aug 15, 2018 at 03:32:02PM +0300, Kirill Shcherbatov wrote:
> This problem triggered asan checks on start tarantool
> with existent xlog. We don't have to touch even static
> non-initialized memory.
> ---
> Branch: http://github.com/tarantool/tarantool/tree/kshch/vinyl-xlog-out-of-static-memory
>
> src/box/xlog.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/src/box/xlog.c b/src/box/xlog.c
> index 5ed11fc..797f153 100644
> --- a/src/box/xlog.c
> +++ b/src/box/xlog.c
> @@ -261,8 +261,11 @@ xlog_meta_parse(struct xlog_meta *meta, const char **data,
> assert(val <= val_end);
> pos = eol + 1;
>
> - if (memcmp(key, INSTANCE_UUID_KEY, key_end - key) == 0 ||
> - memcmp(key, INSTANCE_UUID_KEY_V12, key_end - key) == 0) {
> + size_t len = key_end - key;
> + if ((len == strlen(INSTANCE_UUID_KEY) &&
> + memcmp(key, INSTANCE_UUID_KEY, len) == 0) ||
> + (len == strlen(INSTANCE_UUID_KEY_V12) &&
> + memcmp(key, INSTANCE_UUID_KEY_V12, key_end - key) == 0)) {
Too much of code duplication. Please add a helper for key matching.
> /*
> * Instance: <uuid>
> */
> @@ -277,19 +280,22 @@ xlog_meta_parse(struct xlog_meta *meta, const char **data,
> diag_set(XlogError, "can't parse instance UUID");
> return -1;
> }
> - } else if (memcmp(key, VCLOCK_KEY, key_end - key) == 0){
> + } else if (len == strlen(VCLOCK_KEY) &&
> + memcmp(key, VCLOCK_KEY, len) == 0) {
> /*
> * VClock: <vclock>
> */
> if (parse_vclock(val, val_end, &meta->vclock) != 0)
> return -1;
> - } else if (memcmp(key, PREV_VCLOCK_KEY, key_end - key) == 0) {
> + } else if (len == strlen(PREV_VCLOCK_KEY) &&
> + memcmp(key, PREV_VCLOCK_KEY, len) == 0) {
> /*
> * PrevVClock: <vclock>
> */
> if (parse_vclock(val, val_end, &meta->prev_vclock) != 0)
> return -1;
> - } else if (memcmp(key, VERSION_KEY, key_end - key) == 0) {
> + } else if (len == strlen(VERSION_KEY) &&
> + memcmp(key, VERSION_KEY, len) == 0) {
> /* Ignore Version: for now */
> } else {
> /*
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