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| author | WANG Rui <wangrui@loongson.cn> | 2023-07-28 10:30:42 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-07-28 10:30:42 +0800 |
| commit | e66d511fc92201ba481392e54896f1aeadfcf0e9 (patch) | |
| tree | 4e520ef70f54e959e6ffd4c523b4c9f4dbf706cd /arch/loongarch/lib/clear_user.S | |
| parent | 83da30d73b86ab5898fb84f8b49c11557c3fcc67 (diff) | |
| download | linux-stable-e66d511fc92201ba481392e54896f1aeadfcf0e9.tar.gz linux-stable-e66d511fc92201ba481392e54896f1aeadfcf0e9.tar.bz2 linux-stable-e66d511fc92201ba481392e54896f1aeadfcf0e9.zip | |
LoongArch: Fix return value underflow in exception path
This patch fixes an underflow issue in the return value within the
exception path, specifically at .Llt8 when the remaining length is less
than 8 bytes.
Cc: stable@vger.kernel.org
Fixes: 8941e93ca590 ("LoongArch: Optimize memory ops (memset/memcpy/memmove)")
Reported-by: Weihao Li <liweihao@loongson.cn>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/lib/clear_user.S')
| -rw-r--r-- | arch/loongarch/lib/clear_user.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/loongarch/lib/clear_user.S b/arch/loongarch/lib/clear_user.S index fd1d62b244f2..9dcf71719387 100644 --- a/arch/loongarch/lib/clear_user.S +++ b/arch/loongarch/lib/clear_user.S @@ -108,6 +108,7 @@ SYM_FUNC_START(__clear_user_fast) addi.d a3, a2, -8 bgeu a0, a3, .Llt8 15: st.d zero, a0, 0 + addi.d a0, a0, 8 .Llt8: 16: st.d zero, a2, -8 @@ -188,7 +189,7 @@ SYM_FUNC_START(__clear_user_fast) _asm_extable 13b, .L_fixup_handle_0 _asm_extable 14b, .L_fixup_handle_1 _asm_extable 15b, .L_fixup_handle_0 - _asm_extable 16b, .L_fixup_handle_1 + _asm_extable 16b, .L_fixup_handle_0 _asm_extable 17b, .L_fixup_handle_s0 _asm_extable 18b, .L_fixup_handle_s0 _asm_extable 19b, .L_fixup_handle_s0 |