[PATCH 5.11 328/601] media: atomisp: Fixed error handling path

Greg Kroah-Hartman
2021-05-12T17:39:28Z

From: Souptick Joarder <jrdr.linux@gmail.com>

[ Upstream commit 16a5dcf7fbc2f5cd10c1e6264262bfa3832fb7d5 ]

Inside alloc_user_pages() based on flag value either pin_user_pages()
or get_user_pages_fast() will be called. However, these API might fail.

But free_user_pages() called in error handling path doesn't bother
about return value and will try to unpin bo->pgnr pages, which is
incorrect.

Fix this by passing the page_nr to free_user_pages(). If page_nr > 0
pages will be unpinned based on bo->mem_type. This will also take care
of non error handling path.

allocation")

Link: https://lore.kernel.org/linux-media/1601219284-13275-1-git-send-email-jrdr.linux@gmail.com
Fixes: 14a638ab96c5 ("media: atomisp: use pin_user_pages() for memory
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/media/atomisp/pci/hmm/hmm_bo.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c b/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
index f13af2329f48..0168f9839c90 100644
--- a/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
+++ b/drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
@@ -857,16 +857,17 @@ static void free_private_pages(struct hmm_buffer_object *bo,
kfree(bo->page_obj);
}

-static void free_user_pages(struct hmm_buffer_object *bo)
+static void free_user_pages(struct hmm_buffer_object *bo,
+ unsigned int page_nr)
{
int i;

hmm_mem_stat.usr_size -= bo->pgnr;

if (bo->mem_type == HMM_BO_MEM_TYPE_PFN) {
- unpin_user_pages(bo->pages, bo->pgnr);
+ unpin_user_pages(bo->pages, page_nr);
} else {
- for (i = 0; i < bo->pgnr; i++)
+ for (i = 0; i < page_nr; i++)
put_page(bo->pages[i]);
}
kfree(bo->pages);
@@ -942,6 +943,8 @@ static int alloc_user_pages(struct hmm_buffer_object *bo,
dev_err(atomisp_dev,
"get_user_pages err: bo->pgnr = %d, pgnr actually pinned = %d.\n",
bo->pgnr, page_nr);
+ if (page_nr < 0)
+ page_nr = 0;
goto out_of_mem;
}

@@ -954,7 +957,7 @@ static int alloc_user_pages(struct hmm_buffer_object *bo,

out_of_mem:

- free_user_pages(bo);
+ free_user_pages(bo, page_nr);

return -ENOMEM;
}
@@ -1037,7 +1040,7 @@ void hmm_bo_free_pages(struct hmm_buffer_object *bo)
if (bo->type == HMM_BO_PRIVATE)
free_private_pages(bo, &dynamic_pool, &reserved_pool);
else if (bo->type == HMM_BO_USER)
- free_user_pages(bo);
+ free_user_pages(bo, bo->pgnr);
else
dev_err(atomisp_dev, "invalid buffer type.\n");
mutex_unlock(&bo->mutex);
--
2.30.2