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Re: [PATCH] libio: Free backup area when it not required (BZ#22415)

From: Florian Weimer <fweimer at redhat dot com>
To: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>, libc-alpha at sourceware dot org, Andreas Schwab <schwab at suse dot de>
Date: Thu, 14 Dec 2017 12:57:42 +0100
Subject: Re: [PATCH] libio: Free backup area when it not required (BZ#22415)
Authentication-results: sourceware.org; auth=none
References: <1511962793-14533-1-git-send-email-adhemerval.zanella@linaro.org>

On 11/29/2017 02:39 PM, Adhemerval Zanella wrote:

Some libio operations fail to correctly free the backup area (created
by_IO_{w}default_pbackfail on unget{w}c) resulting in either invalid
buffer free operations or memory leaks.

For instance, on the example provided by BZ#22415 a following
fputc after a fseek to rewind the stream issues an invalid free on
the buffer.

Do we have to treat this as a security bug? I don't think so, but I'dstill like a second opinion.


Thanks,
Florian

Follow-Ups:
- Re: [PATCH] libio: Free backup area when it not required (BZ#22415)
  - From: Adhemerval Zanella

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