gpu: nvgpu: fix perf output buffer size validation

Currently we check if offset + size of perf output buffer crosses
4GB boundary. This check should be fixed to offset + size - 1.

Bug 200422626

Change-Id: I87b1c0761a97903780ddde871d5ca396bf26170d
Signed-off-by: Aparna Das <aparnad@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1758338
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c b/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
index 938e0abd..383bdca9 100644
--- a/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
+++ b/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
@@ -1383,7 +1383,7 @@ static int gk20a_perfbuf_map(struct dbg_session_gk20a *dbg_s,
 
         /* perf output buffer may not cross a 4GB boundary */
         virt_size = u64_lo32(args->mapping_size);
-        if (u64_hi32(args->offset) != u64_hi32(args->offset + virt_size)) {
+        if (u64_hi32(args->offset) != u64_hi32(args->offset + virt_size - 1)) {
                 err = -EINVAL;
                 goto err_unmap;
         }