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lib/lzo: fix bugs for very short or empty input

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For very short input data (0 - 1 bytes), lzo-rle was not behaving
correctly.  Fix this behaviour and update documentation accordingly.

For zero-length input, lzo v0 outputs an end-of-stream marker only,
which was misinterpreted by lzo-rle as a bitstream version number.
Ensure bitstream versions > 0 require a minimum stream length of 5.

Also fixes a bug in handling the tail for very short inputs when a
bitstream version is present.

Link: http://lkml.kernel.org/r/20190326165857.34613-1-dave.rodgman@arm.com
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Rodgman
2019-04-05 18:38:58 -07:00
committed by Linus Torvalds
parent 6147e136ff
commit b11ed18efa
3 changed files with 12 additions and 9 deletions
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4
lib/lzo/lzo1x_decompress_safe.c
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@@ -54,11 +54,9 @@ int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
if (unlikely(in_len < 3))
goto input_overrun;
if (likely(*ip == 17)) {
if (likely(in_len >= 5) && likely(*ip == 17)) {
bitstream_version = ip[1];
ip += 2;
if (unlikely(in_len < 5))
goto input_overrun;
} else {
bitstream_version = 0;
}