diff options
| -rw-r--r-- | scripts/mod/modpost.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index abbcd3fc1394..0d2f1f09019b 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1689,8 +1689,17 @@ void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, va_start(ap, fmt); len = vsnprintf(tmp, SZ, fmt, ap); - buf_write(buf, tmp, len); va_end(ap); + + if (len < 0) { + perror("vsnprintf failed"); + exit(1); + } + if (len >= SZ) + fatal("buf_printf output truncated for string %s: %d bytes needed, %d available\n", + tmp, len + 1, SZ); + + buf_write(buf, tmp, len); } void buf_write(struct buffer *buf, const char *s, int len) |