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BUG/MINOR: Fix several leaks of 'log_tag' in init().

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We use chunk_initstr() to store the program name as the default log-tag.

If we use the log-tag directive in the config file, this chunk will be
destroyed and replaced. chunk_initstr() sets the chunk size to 0 so we
will free the chunk itself, but not its content.

This happens for a global section and also for a proxy.

We fix this by using chunk_initlen() instead of chunk_initstr().
We also check that the memory allocation was successfull, otherwise we quit.

This fixes github issue #850.
It can be backported as far as 1.9, with minor adjustments to includes.
This commit is contained in:
Eric Salama 2020-10-02 11:58:19 +02:00 committed by Christopher Faulet
parent 1d0206e71f
commit 7cea6065ac
3 changed files with 22 additions and 3 deletions
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9
src/cfgparse-global.c
View File

@ -11,6 +11,7 @@
#include <fcntl.h>
#include <unistd.h>
#include <haproxy/buf.h>
#include <haproxy/cfgparse.h>
#include <haproxy/compression.h>
#include <haproxy/global.h>
@ -948,7 +949,13 @@ int cfg_parse_global(const char *file, int linenum, char **args, int kwm)
goto out;
}
chunk_destroy(&global.log_tag);
chunk_initstr(&global.log_tag, strdup(args[1]));
chunk_initlen(&global.log_tag, strdup(args[1]), strlen(args[1]), strlen(args[1]));
if (b_orig(&global.log_tag) == NULL) {
chunk_destroy(&global.log_tag);
ha_alert("parsing [%s:%d]: cannot allocate memory for '%s'.\n", file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
}
else if (!strcmp(args[0], "spread-checks")) { /* random time between checks (0-50) */
if (alertif_too_many_args(1, file, linenum, args, &err_code))

9
src/cfgparse-listen.c
View File

@ -12,6 +12,7 @@
#include <unistd.h>
#include <haproxy/acl.h>
#include <haproxy/buf.h>
#include <haproxy/capture-t.h>
#include <haproxy/cfgparse.h>
#include <haproxy/check.h>
@ -2821,7 +2822,13 @@ stats_error_parsing:
goto out;
}
chunk_destroy(&curproxy->log_tag);
chunk_initstr(&curproxy->log_tag, strdup(args[1]));
chunk_initlen(&curproxy->log_tag, strdup(args[1]), strlen(args[1]), strlen(args[1]));
if (b_orig(&curproxy->log_tag) == NULL) {
chunk_destroy(&curproxy->log_tag);
ha_alert("parsing [%s:%d]: cannot allocate memory for '%s'.\n", file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
}
else if (!strcmp(args[0], "log")) { /* "no log" or "log ..." */
if (!parse_logsrv(args, &curproxy->logsrvs, (kwm == KWM_NO), &errmsg)) {

7
src/haproxy.c
View File

@ -1595,7 +1595,12 @@ static void init(int argc, char **argv)
progname = tmp + 1;
/* the process name is used for the logs only */
chunk_initstr(&global.log_tag, strdup(progname));
chunk_initlen(&global.log_tag, strdup(progname), strlen(progname), strlen(progname));
if (b_orig(&global.log_tag) == NULL) {
chunk_destroy(&global.log_tag);
ha_alert("Cannot allocate memory for log_tag.\n");
exit(EXIT_FAILURE);
}
argc--; argv++;
while (argc > 0) {