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arch/mips/kernel/traps: use vma_lookup() instead of find_vma()

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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.

Link: https://lkml.kernel.org/r/20210521174745.2219620-8-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam Howlett 2021-06-28 19:39:08 -07:00 • committed by Linus Torvalds
parent 900c83f88a
commit 7f7020ac0d
1 changed files with 1 additions and 3 deletions
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4
arch/mips/kernel/traps.c
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@ -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 process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
{ {
int si_code; int si_code;
struct vm_area_struct *vma;
switch (sig) { switch (sig) {
case 0: case 0:
@ -800,8 +799,7 @@ int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
case SIGSEGV: case SIGSEGV:
mmap_read_lock(current->mm); mmap_read_lock(current->mm);
vma = find_vma(current->mm, (unsigned long)fault_addr); if (vma_lookup(current->mm, (unsigned long)fault_addr))
if (vma && (vma->vm_start <= (unsigned long)fault_addr))
si_code = SEGV_ACCERR; si_code = SEGV_ACCERR;
else else
si_code = SEGV_MAPERR; si_code = SEGV_MAPERR;