[PATCH v2 12/53] objtool/klp: Fix cloning of zero-length section symbols

[Josh Poimboeuf]

Fix NULL dereference when cloning a symbol from an empty section.
sec->data is only populated for sections with non-zero size.

Fixes: dd590d4d57eb ("objtool/klp: Introduce klp diff subcommand for diffing object files")
Acked-by: Song Liu <song@xxxxxxxxxx>
Reviewed-by: Miroslav Benes <mbenes@xxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 tools/objtool/klp-diff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/klp-diff.c b/tools/objtool/klp-diff.c
index a226e99948b3..17a6146b9406 100644
--- a/tools/objtool/klp-diff.c
+++ b/tools/objtool/klp-diff.c
@@ -681,7 +681,7 @@ static struct symbol *__clone_symbol(struct elf *elf, struct symbol *patched_sym
 			size_t size;
 
 			/* bss doesn't have data */
-			if (patched_sym->sec->data->d_buf)
+			if (patched_sym->sec->data && patched_sym->sec->data->d_buf)
 				data = patched_sym->sec->data->d_buf + patched_sym->offset;
 
 			if (is_sec_sym(patched_sym))
-- 
2.53.0