util/os_file: resize buffer to what was actually needed

Fixes: 316964709e21286c2af5 "util: add os_read_file() helper"
Reported-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
(cherry picked from commit 955c63d3643f30d7db0c5d16e06a5eda4f62f889)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/util/os_file.c b/src/util/os_file.c
index da17d12b50e..18727d1121f 100644
--- a/src/util/os_file.c
+++ b/src/util/os_file.c
@@ -92,6 +92,17 @@ os_read_file(const char *filename)
    if (read > 0)
       offset += read;
 
+   /* Final resize to actual size */
+   len = offset + 1;
+   char *newbuf = realloc(buf, len);
+   if (!newbuf) {
+      free(buf);
+      close(fd);
+      errno = -ENOMEM;
+      return NULL;
+   }
+   buf = newbuf;
+
    buf[offset] = '\0';
 
    return buf;