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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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12
arguments.c
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@ -125,7 +125,7 @@ args_free(struct args *args)
size_t
args_print(struct args *args, char *buf, size_t len)
{
size_t off;
size_t off, used;
int i;
const char *quotes;
struct args_entry *entry;
@ -165,9 +165,12 @@ args_print(struct args *args, char *buf, size_t len)
quotes = "\"";
else
quotes = "";
off += xsnprintf(buf + off, len - off, "%s-%c %s%s%s",
used = xsnprintf(buf + off, len - off, "%s-%c %s%s%s",
off != 0 ? " " : "", entry->flag, quotes, entry->value,
quotes);
if (used > len - off)
used = len - off;
off += used;
}
/* And finally the argument vector. */
@ -181,8 +184,11 @@ args_print(struct args *args, char *buf, size_t len)
quotes = "\"";
else
quotes = "";
off += xsnprintf(buf + off, len - off, "%s%s%s%s",
used = xsnprintf(buf + off, len - off, "%s%s%s%s",
off != 0 ? " " : "", quotes, args->argv[i], quotes);
if (used > len - off)
used = len - off;
off += used;
}
return (off);