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media: atomisp: Fixed error handling path

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[ 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>
This commit is contained in:
Souptick Joarder 2020-09-27 17:08:04 +02:00 committed by Greg Kroah-Hartman
parent cc4cc2fb5a
commit 96498fbb7b
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/staging/media/atomisp/pci/hmm/hmm_bo.c
View File

@ -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);