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Avoid copying error message to limited size buffer to log #642

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25 changes: 10 additions & 15 deletions src/proto/nc_redis.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3206,26 +3206,21 @@ redis_swallow_msg(struct conn *conn, struct msg *pmsg, struct msg *msg)
{
if (pmsg != NULL && pmsg->type == MSG_REQ_REDIS_SELECT &&
msg != NULL && redis_error(msg)) {
struct server* conn_server;
struct server_pool* conn_pool;
struct mbuf* rsp_buffer;
uint8_t message[128];
size_t copy_len;
const struct server* conn_server;
const struct server_pool* conn_pool;
const struct mbuf* rsp_buffer;

/*
* Get a substring from the message so that the initial - and the trailing
* \r\n is removed.
*/
conn_server = (struct server*)conn->owner;
conn_pool = conn_server->owner;
rsp_buffer = STAILQ_LAST(&msg->mhdr, mbuf, next);
copy_len = MIN(mbuf_length(rsp_buffer) - 3, sizeof(message) - 1);

nc_memcpy(message, &rsp_buffer->start[1], copy_len);
message[copy_len] = 0;

log_warn("SELECT %d failed on %s | %s: %s",
/*
* Get a substring from the message so that the initial - and the trailing
* \r\n is removed.
*/
log_warn("SELECT %d failed on %s | %s: %.*s",
conn_pool->redis_db, conn_pool->name.data,
conn_server->name.data, message);
conn_server->name.data,
MAX((int)mbuf_length(rsp_buffer) - 3, 0), &rsp_buffer->start[1]);
}
}