Messages in this thread Patch in this message | | | From | Caleb Jorden <> | Subject | [PATCH 1/1] lz4: fix system halt at boot kernel on x86_64 | Date | Sun, 3 May 2015 22:58:59 -0500 |
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Sometimes, on x86_64, decompression fails with the following error:
Decompressing Linux...
Decoding failed
-- System halted
This condition is not needed for a 64bit kernel(from commit d5e7caf):
if( ... || (op + COPYLENGTH) > oend) goto _output_error
macro LZ4_SECURE_COPY() tests op and does not copy any data when op exceeds the value.
added by analogy to lz4_uncompress_unknownoutputsize(...)
Signed-off-by: Krzysztof Kolasa <kkolasa@winsoft.pl> Tested-by: Alexander Kuleshov <kuleshovmail@gmail.com> Tested-by: Caleb Jorden <cjorden@gmail.com> --- lib/lz4/lz4_decompress.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c index f0f5c5c..8a742b1 100644 --- a/lib/lz4/lz4_decompress.c +++ b/lib/lz4/lz4_decompress.c @@ -139,8 +139,12 @@ static int lz4_uncompress(const char *source, char *dest, int osize) /* Error: request to write beyond destination buffer */ if (cpy > oend) goto _output_error; +#if LZ4_ARCH64 + if ((ref + COPYLENGTH) > oend) +#else if ((ref + COPYLENGTH) > oend || (op + COPYLENGTH) > oend) +#endif goto _output_error; LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH)); while (op < cpy) @@ -270,7 +274,13 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest, if (cpy > oend - COPYLENGTH) { if (cpy > oend) goto _output_error; /* write outside of buf */ - +#if LZ4_ARCH64 + if ((ref + COPYLENGTH) > oend) +#else + if ((ref + COPYLENGTH) > oend || + (op + COPYLENGTH) > oend) +#endif + goto _output_error; LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH)); while (op < cpy) *op++ = *ref++; -- 2.4.0
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