objtool: Fix verbose disassembly if CROSS_COMPILE isn't set

[ Upstream commit e77956e4e5c11218e60a1fe8cdbccd02476f2e56 ]

In verbose mode, when printing the disassembly of affected functions, if
CROSS_COMPILE isn't set, the objdump command string gets prefixed with
"(null)".

Somehow this worked before.  Maybe some versions of glibc return an
empty string instead of NULL.  Fix it regardless.

[ jpoimboe: Rewrite commit log. ]

Fixes: ca653464dd ("objtool: Add verbose option for disassembling affected functions")
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250215142321.14081-1-david.laight.linux@gmail.com
Link: https://lore.kernel.org/r/b931a4786bc0127aa4c94e8b35ed617dcbd3d3da.1743481539.git.jpoimboe@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

This commit is contained in:

David Laight

2025-03-31 21:26:42 -07:00

committed by

Greg Kroah-Hartman

parent 10856c530d

commit 22e1e4e11a

1 changed files with 2 additions and 0 deletions

									
										tools/objtool/check.c
									
		+2
		
												View File
												
				@@ -4614,6 +4614,8 @@ static int disas_funcs(const char *funcs)

					char *cmd;

					cross_compile = getenv("CROSS_COMPILE");

					if (!cross_compile)

						cross_compile = "";

					objdump_str = "%sobjdump -wdr %s | gawk -M -v _funcs='%s' '"

							"BEGIN { split(_funcs, funcs); }"