diff options
| -rw-r--r-- | argp/argp-fmtstream.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/argp/argp-fmtstream.c b/argp/argp-fmtstream.c index d06ea8453b..215160bdcd 100644 --- a/argp/argp-fmtstream.c +++ b/argp/argp-fmtstream.c @@ -385,10 +385,11 @@ __argp_fmtstream_ensure (struct argp_fmtstream *fs, size_t amount) if ((size_t) (fs->end - fs->buf) < amount) /* Gotta grow the buffer. */ { - size_t new_size = fs->end - fs->buf + amount; - char *new_buf = realloc (fs->buf, new_size); + size_t old_size = fs->end - fs->buf; + size_t new_size = old_size + amount; + char *new_buf; - if (! new_buf) + if (new_size < old_size || ! (new_buf = realloc (fs->buf, new_size))) { __set_errno (ENOMEM); return 0; |