[tip: objtool/urgent] objtool: Fix off-by-one in symbol_by_offset()

[tip-bot2 for Julien Thierry]

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     7f9b34f36cf6b2099f19e679a9e8315c955ef2ee
Gitweb:        https://git.kernel.org/tip/7f9b34f36cf6b2099f19e679a9e8315c955ef2ee
Author:        Julien Thierry <jthierry@xxxxxxxxxx>
AuthorDate:    Fri, 03 Apr 2020 14:17:30 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 22 Apr 2020 23:14:46 +02:00

objtool: Fix off-by-one in symbol_by_offset()

Sometimes, WARN_FUNC() and other users of symbol_by_offset() will
associate the first instruction of a symbol with the symbol preceding
it.  This is because symbol->offset + symbol->len is already outside of
the symbol's range.

Fixes: 2a362ecc3ec9 ("objtool: Optimize find_symbol_*() and read_symbols()")
Signed-off-by: Julien Thierry <jthierry@xxxxxxxxxx>
Reviewed-by: Miroslav Benes <mbenes@xxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 tools/objtool/elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 09ddc8f..c4857fa 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -105,7 +105,7 @@ static int symbol_by_offset(const void *key, const struct rb_node *node)
 
 	if (*o < s->offset)
 		return -1;
-	if (*o > s->offset + s->len)
+	if (*o >= s->offset + s->len)
 		return 1;
 
 	return 0;