shithub: aacdec

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ref: 1b71a6ba963d131375f5e489b3b25e36f19f3f24
parent: 1073aeef823cafd844704389e9a497c257768e2f
author: Fabian Greffrath <fabian@greffrath.com>
date: Mon Aug 31 06:00:37 EDT 2020

fix heap-buffer-overflow in mp4read.c

This originated from an integer overflow: If mp4config.frame.ents
would be read-in with a value of (uint32t)(-1), it would overflow to 0
in the size calculation for the allocation in the next line. The
malloc() function would then successfully return a pointer to a memory
region of size 0, which will cause a segfault when written to.

Fixes #57.

--- a/frontend/mp4read.c

+++ b/frontend/mp4read.c

@@ -344,7 +344,10 @@

     u32in();

     // Number of entries

     mp4config.frame.ents = u32in();

-    // fixme: check atom size

+

+    if (!(mp4config.frame.ents + 1))

+        return ERR_FAIL;

+

     mp4config.frame.data = malloc(sizeof(*mp4config.frame.data)

                                   * (mp4config.frame.ents + 1));