modpost: fix off by one in is_executable_section()

[ Upstream commit 3a3f1e573a105328a2cca45a7cfbebabbf5e3192 ]

The > comparison should be >= to prevent an out of bounds array
access.

Fixes: 52dc0595d540 ("modpost: handle relocations mismatch in __ex_table.")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 9e370e7..e6be7fc 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1297,7 +1297,7 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf,
 
 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
 {
-       if (section_index > elf->num_sections)
+       if (section_index >= elf->num_sections)
                fatal("section_index is outside elf->num_sections!\n");
 
        return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);