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Avoid evaluating log arguments when log filtered by level. (#8685)

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yoav-steinberg 2021-03-24 08:22:12 +02:00 committed by GitHub
parent a2af2a306b
commit d026647f4f
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2 changed files with 10 additions and 5 deletions
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4
src/server.c
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@ -1161,12 +1161,10 @@ void serverLogRaw(int level, const char *msg) {
/* Like serverLogRaw() but with printf-alike support. This is the function that
* is used across the code. The raw version is only used in order to dump
* the INFO output on crash. */
void serverLog(int level, const char *fmt, ...) {
void _serverLog(int level, const char *fmt, ...) {
va_list ap;
char msg[LOG_MAX_LEN];
if ((level&0xff) < server.verbosity) return;
va_start(ap, fmt);
vsnprintf(msg, sizeof(msg), fmt, ap);
va_end(ap);

11
src/server.h
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@ -2210,10 +2210,10 @@ void preventCommandAOF(client *c);
void preventCommandReplication(client *c);
int prepareForShutdown(int flags);
#ifdef __GNUC__
void serverLog(int level, const char *fmt, ...)
void _serverLog(int level, const char *fmt, ...)
__attribute__((format(printf, 2, 3)));
#else
void serverLog(int level, const char *fmt, ...);
void _serverLog(int level, const char *fmt, ...);
#endif
void serverLogRaw(int level, const char *msg);
void serverLogFromHandler(int level, const char *msg);
@ -2719,6 +2719,13 @@ void killIOThreads(void);
void killThreads(void);
void makeThreadKillable(void);
/* Use macro for checking log level to avoid evaluating arguments in cases log
* should be ignored due to low level. */
#define serverLog(level, ...) do {\
if (((level)&0xff) < server.verbosity) break;\
_serverLog(level, __VA_ARGS__);\
} while(0)
/* TLS stuff */
void tlsInit(void);
void tlsCleanup(void);