4.19-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Wahren wahrenst@gmx.net
[ Upstream commit 72ad3b772b6d393701df58ba1359b0bb346a19ed ]
Running a multi-arch kernel (multi_v7_defconfig) on a Raspberry Pi 3B+ with enabled CONFIG_UBSAN triggers the following warning:
UBSAN: array-index-out-of-bounds in arch/arm/mach-sunxi/mc_smp.c:810:29 index 2 is out of range for type 'sunxi_mc_smp_data [2]' CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.7.0-rc6-00248-g5254c0cbc92d Hardware name: BCM2835 unwind_backtrace from show_stack+0x10/0x14 show_stack from dump_stack_lvl+0x40/0x4c dump_stack_lvl from ubsan_epilogue+0x8/0x34 ubsan_epilogue from __ubsan_handle_out_of_bounds+0x78/0x80 __ubsan_handle_out_of_bounds from sunxi_mc_smp_init+0xe4/0x4cc sunxi_mc_smp_init from do_one_initcall+0xa0/0x2fc do_one_initcall from kernel_init_freeable+0xf4/0x2f4 kernel_init_freeable from kernel_init+0x18/0x158 kernel_init from ret_from_fork+0x14/0x28
Since the enabled method couldn't match with any entry from sunxi_mc_smp_data, the value of the index shouldn't be used right after the loop. So move it after the check of ret in order to have a valid index.
Fixes: 1631090e34f5 ("ARM: sun9i: smp: Add is_a83t field") Signed-off-by: Stefan Wahren wahrenst@gmx.net Link: https://lore.kernel.org/r/20231228193903.9078-1-wahrenst@gmx.net Reviewed-by: Chen-Yu Tsai wens@csie.org Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/mach-sunxi/mc_smp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c index ff173e67eed21..527bb82072d9a 100644 --- a/arch/arm/mach-sunxi/mc_smp.c +++ b/arch/arm/mach-sunxi/mc_smp.c @@ -805,12 +805,12 @@ static int __init sunxi_mc_smp_init(void) break; }
- is_a83t = sunxi_mc_smp_data[i].is_a83t; - of_node_put(node); if (ret) return -ENODEV;
+ is_a83t = sunxi_mc_smp_data[i].is_a83t; + if (!sunxi_mc_smp_cpu_table_init()) return -EINVAL;