tree ee50d75ba3589c76b45525a8b0c30eb85d6634a7
parent 8218a437234309faa5725f82c33c3523788d5f68
author Lasse Collin <lasse.collin@tukaani.org> 1294880477 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1294934604 -0800

Decompressors: check for read errors in decompress_unlzma.c

Return value of rc->fill() is checked in rc_read() and error() is called
when needed, but then the code continues as if nothing had happened.

rc_read() is a void function and it's on the top of performance critical
call stacks, so propagating the error code via return values doesn't sound
like the best fix.  It seems better to check rc->buffer_size (which holds
the return value of rc->fill()) in the main loop.  It does nothing bad
that the code runs a little with unknown data after a failed rc->fill().

This fixes an infinite loop in initramfs decompression if the
LZMA-compressed initramfs image is corrupt.

Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>