linux-kernel - [PATCH] arm64/module-plts: Consider the special case where plt_max

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Date:   Tue,  7 Jul 2020 07:46:08 -0400
From:   Peng Hao <richard.peng@...o.com>
To:     catalin.marinas@....com, will@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Hao <richard.peng@...o.com>
Subject: [PATCH] arm64/module-plts: Consider the special case where plt_max_entries is 0

If plt_max_entries is 0, a warning is triggered.
WARNING: CPU: 200 PID: 3000 at arch/arm64/kernel/module-plts.c:97 module_emit_plt_entry+0xa4/0x150

Signed-off-by: Peng Hao <richard.peng@...o.com>
---
 arch/arm64/kernel/module-plts.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
index 65b08a74aec6..1868c9ac13f2 100644
--- a/arch/arm64/kernel/module-plts.c
+++ b/arch/arm64/kernel/module-plts.c
@@ -79,7 +79,8 @@ u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
 	int i = pltsec->plt_num_entries;
 	int j = i - 1;
 	u64 val = sym->st_value + rela->r_addend;
-
+	if (pltsec->plt_max_entries == 0)
+		return 0;
 	if (is_forbidden_offset_for_adrp(&plt[i].adrp))
 		i++;
 
-- 
2.18.4