forked from SLFO-pool/xen
31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
# Commit 303d3ff85c90ee4af4bad4e3b1d4932fa2634d64
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# Date 2024-07-30 11:55:56 +0200
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# Author Ross Lagerwall <ross.lagerwall@citrix.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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bunzip2: fix rare decompression failure
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The decompression code parses a huffman tree and counts the number of
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symbols for a given bit length. In rare cases, there may be >= 256
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symbols with a given bit length, causing the unsigned char to overflow.
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This causes a decompression failure later when the code tries and fails to
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find the bit length for a given symbol.
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Since the maximum number of symbols is 258, use unsigned short instead.
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Fixes: ab77e81f6521 ("x86/dom0: support bzip2 and lzma compressed bzImage payloads")
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Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
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Acked-by: Jan Beulich <jbeulich@suse.com>
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--- a/xen/common/bunzip2.c
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+++ b/xen/common/bunzip2.c
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@@ -221,7 +221,8 @@ static int __init get_next_block(struct
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RUNB) */
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symCount = symTotal+2;
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for (j = 0; j < groupCount; j++) {
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- unsigned char length[MAX_SYMBOLS], temp[MAX_HUFCODE_BITS+1];
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+ unsigned char length[MAX_SYMBOLS];
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+ unsigned short temp[MAX_HUFCODE_BITS+1];
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int minLen, maxLen, pp;
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/* Read Huffman code lengths for each symbol. They're
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stored in a way similar to mtf; record a starting
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