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-rw-r--r--argp/argp-fmtstream.c7
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;