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io: Fix use-after-free in ftw [BZ #26779]

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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit ee52ab25ba)
This commit is contained in:
Martin Sebor 2022-01-25 17:39:02 -07:00 committed by Florian Weimer
parent 06afa5e09f
commit deea6ab1bc
1 changed files with 3 additions and 2 deletions
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io/ftw.c
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@ -324,8 +324,9 @@ open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
buf[actsize++] = '\0';
/* Shrink the buffer to what we actually need. */
data->dirstreams[data->actdir]->content = realloc (buf, actsize);
if (data->dirstreams[data->actdir]->content == NULL)
void *content = realloc (buf, actsize);
data->dirstreams[data->actdir]->content = content;
if (content == NULL)
{
int save_err = errno;
free (buf);