From: Volodymyr G. Lukiianyk <volodymyrgl@gmail.com>
Date: Thu, 16 Oct 2008 05:01:15 +0000 (-0700)
Subject: uclinux: fix gzip header parsing in binfmt_flat.c
X-Git-Tag: v2.6.28-rc1~557
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4cfb18d7917ecb397b3497e931a2a23175709b7;p=pandora-kernel.git

uclinux: fix gzip header parsing in binfmt_flat.c

There are off-by-one errors in decompress_exec() when calculating the length of
optional "original file name" and "comment" fields: the "ret" index is not
incremented when terminating '\0' character is reached. The check of the buffer
overflow (after an "extra-field" length was taken into account) is also fixed.

I've encountered this off-by-one error when tried to reuse
gzip-header-parsing part of the decompress_exec() function.  There was an
"original file name" field in the payload (with miscalculated length) and
zlib_inflate() returned Z_DATA_ERROR.  But after the fix similar to this
one all worked fine.

Signed-off-by: Volodymyr G Lukiianyk <volodymyrgl@gmail.com>
Acked-by: Greg Ungerer <gerg@snapgear.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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