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libbacktrace: add cast to avoid undefined shift

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Patch from pgerell@github.

	* elf.c (elf_uncompress_lzma_block): Add casts to avoid
	potentially shifting a value farther than its type size.
This commit is contained in:
Ian Lance Taylor
2025-02-10 15:03:31 -08:00
parent 78af4ffa26
commit 0034e33946
1 changed files with 1 additions and 1 deletions
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2
elf.c
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@@ -5878,7 +5878,7 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
/* The byte at compressed[off] is ignored for some /* The byte at compressed[off] is ignored for some
reason. */ reason. */
code = ((uint32_t)(compressed[off + 1] << 24) code = (((uint32_t)compressed[off + 1] << 24)
+ ((uint32_t)compressed[off + 2] << 16) + ((uint32_t)compressed[off + 2] << 16)
+ ((uint32_t)compressed[off + 3] << 8) + ((uint32_t)compressed[off + 3] << 8)
+ (uint32_t)compressed[off + 4]); + (uint32_t)compressed[off + 4]);