From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 10 Feb 2025 23:03:31 +0000 (-0800)
Subject: libbacktrace: add cast to avoid undefined shift
X-Git-Tag: basepoints/gcc-16~2092
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d5c72da62d29cfa0fff532c66f28670c2dfcd75e;p=thirdparty%2Fgcc.git

libbacktrace: add cast to avoid undefined shift

Patch from pgerell@github.

	* elf.c (elf_uncompress_lzma_block): Add casts to avoid
	potentially shifting a value farther than its type size.
---

diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index d766fa41a61..868d0e1a7f3 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -5878,7 +5878,7 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
 	  /* The byte at compressed[off] is ignored for some
 	     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 + 3] << 8)
 		  + (uint32_t)compressed[off + 4]);