Commit 278208d9 authored by Lasse Collin's avatar Lasse Collin Committed by Linus Torvalds

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: default avatarLasse 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8218a437
......@@ -631,6 +631,8 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
if (cst.rep0 == 0)
break;
}
if (rc.buffer_size <= 0)
goto exit_3;
}
if (posp)
......@@ -638,6 +640,7 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
if (wr.flush)
wr.flush(wr.buffer, wr.buffer_pos);
ret = 0;
exit_3:
large_free(p);
exit_2:
if (!output)
......
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