[PATCH 07/22] arch/mips/kernel/traps: Use vma_lookup() instead of find_vma()

Liam Howlett
2021-05-10T16:59:54Z

Use vma_lookup() to find the VMA at a specific address. As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
arch/mips/kernel/traps.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 0b4e06303c55..6f07362de5ce 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -784,7 +784,6 @@ void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
{
int si_code;
- struct vm_area_struct *vma;

switch (sig) {
case 0:
@@ -800,8 +799,7 @@ int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)

case SIGSEGV:
mmap_read_lock(current->mm);
- vma = find_vma(current->mm, (unsigned long)fault_addr);
- if (vma && (vma->vm_start <= (unsigned long)fault_addr))
+ if (vma_lookup(current->mm, (unsigned long)fault_addr))
si_code = SEGV_ACCERR;
else
si_code = SEGV_MAPERR;
--
2.30.2