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-rw-r--r--mbbsd/talk.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/mbbsd/talk.c b/mbbsd/talk.c
index 7aee54f2..df570f38 100644
--- a/mbbsd/talk.c
+++ b/mbbsd/talk.c
@@ -654,15 +654,17 @@ my_write(pid_t pid, char *prompt, char *id, int flag, userinfo_t * puin)
!(fri_stat & HFM))))
outmsg("\033[1;33;41m糟糕! 對方防水了! \033[37m~>_<~\033[m");
else {
- if (uin->msgcount < MAX_MSGS) {
+ int write_pos = uin->msgcount; /* try to avoid race */
+ if ( write_pos < (MAX_MSGS - 1) ) { /* race here */
unsigned char pager0 = uin->pager;
+ uin->msgcount = write_pos + 1;
uin->pager = 2;
- uin->msgs[uin->msgcount].pid = currpid;
- strlcpy(uin->msgs[uin->msgcount].userid, cuser.userid,
- sizeof(uin->msgs[uin->msgcount].userid));
- strlcpy(uin->msgs[uin->msgcount++].last_call_in, msg,
- sizeof(uin->msgs[uin->msgcount].last_call_in));
+ uin->msgs[write_pos].pid = currpid;
+ strlcpy(uin->msgs[write_pos].userid, cuser.userid,
+ sizeof(uin->msgs[write_pos].userid));
+ strlcpy(uin->msgs[write_pos].last_call_in, msg,
+ sizeof(uin->msgs[write_pos].last_call_in));
uin->pager = pager0;
} else if (flag != 2)
outmsg("\033[1;33;41m糟糕! 對方不行了! (收到太多水球) \033[37m@_@\033[m");