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Don't blindly increase offsets by the return value of snprintf, if there

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wasn't enough space this will go off the end. Instead clamp to the
available space. Fixes crash reported by Julien Rebetez.
This commit is contained in:
nicm
2014-04-11 19:35:54 +00:00
parent 73c5a487c1
commit b8bda67f30
3 changed files with 24 additions and 12 deletions
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10
cmd-list.c
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@ -103,7 +103,7 @@ size_t
cmd_list_print(struct cmd_list *cmdlist, char *buf, size_t len)
{
struct cmd *cmd;
size_t off;
size_t off, used;
off = 0;
TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
@ -112,8 +112,12 @@ cmd_list_print(struct cmd_list *cmdlist, char *buf, size_t len)
off += cmd_print(cmd, buf + off, len - off);
if (off >= len)
break;
if (TAILQ_NEXT(cmd, qentry) != NULL)
off += xsnprintf(buf + off, len - off, " ; ");
if (TAILQ_NEXT(cmd, qentry) != NULL) {
used = xsnprintf(buf + off, len - off, " ; ");
if (used > len - off)
used = len - off;
off += used;
}
}
return (off);
}