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libbb: prevent resursion on malloc failure

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-08-01 06:53:03 +02:00
parent 6d48d3ee2a
commit e2944af43e
1 changed files with 25 additions and 16 deletions
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41
libbb/verror_msg.c
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@ -15,7 +15,7 @@ const char *msg_eol = "\n";
void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
{
char *msg;
char *msg, *msg1;
int applet_len, strerr_len, msgeol_len, used;
if (!logmode)
@ -36,27 +36,36 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
applet_len = strlen(applet_name) + 2; /* "applet: " */
strerr_len = strerr ? strlen(strerr) : 0;
msgeol_len = strlen(msg_eol);
/* can't use xrealloc: it calls error_msg on failure,
* that may result in a recursion */
/* +3 is for ": " before strerr and for terminating NUL */
msg = xrealloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
/* TODO: maybe use writev instead of memmoving? Need full_writev? */
memmove(msg + applet_len, msg, used);
used += applet_len;
strcpy(msg, applet_name);
msg[applet_len - 2] = ':';
msg[applet_len - 1] = ' ';
if (strerr) {
if (s[0]) { /* not perror_nomsg? */
msg[used++] = ':';
msg[used++] = ' ';
msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
if (!msg1) {
msg[used++] = '\n'; /* overwrites NUL */
applet_len = 0;
} else {
msg = msg1;
/* TODO: maybe use writev instead of memmoving? Need full_writev? */
memmove(msg + applet_len, msg, used);
used += applet_len;
strcpy(msg, applet_name);
msg[applet_len - 2] = ':';
msg[applet_len - 1] = ' ';
if (strerr) {
if (s[0]) { /* not perror_nomsg? */
msg[used++] = ':';
msg[used++] = ' ';
}
strcpy(&msg[used], strerr);
used += strerr_len;
}
strcpy(&msg[used], strerr);
used += strerr_len;
strcpy(&msg[used], msg_eol);
used += msgeol_len;
}
strcpy(&msg[used], msg_eol);
if (logmode & LOGMODE_STDIO) {
fflush(stdout);
full_write(STDERR_FILENO, msg, used + msgeol_len);
full_write(STDERR_FILENO, msg, used);
}
if (logmode & LOGMODE_SYSLOG) {
syslog(LOG_ERR, "%s", msg + applet_len);