From: Souptick Joarder <jrdr.linux@gmail.com>
To: mchehab@kernel.org, sakari.ailus@linux.intel.com,
gregkh@linuxfoundation.org, gustavoars@kernel.org,
akpm@linux-foundation.org, vbabka@suse.cz,
daniel.m.jordan@oracle.com, walken@google.com
Cc: devel@driverdev.osuosl.org, John Hubbard <jhubbard@nvidia.com>,
linux-kernel@vger.kernel.org,
Souptick Joarder <jrdr.linux@gmail.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
linux-media@vger.kernel.org
Subject: [PATCH v2] media: atomisp: Fixed error handling path
Date: Wed, 4 Nov 2020 07:32:11 +0530 [thread overview]
Message-ID: <1604455331-28031-1-git-send-email-jrdr.linux@gmail.com> (raw)
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.
Fixes: 14a638ab96c5 ("media: atomisp: use pin_user_pages() for memory
allocation")
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
---
v2:
Added review tag.
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 f13af23..0168f98 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);
--
1.9.1
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next reply other threads:[~2020-11-04 2:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-04 2:02 Souptick Joarder [this message]
2020-11-04 7:15 ` [PATCH v2] media: atomisp: Fix error handling path Markus Elfring
2020-11-04 8:31 ` Dan Carpenter
2020-11-04 10:30 ` [v2] " Markus Elfring
2020-11-04 11:40 ` Dan Carpenter
2020-11-04 20:50 ` Markus Elfring
2020-11-18 19:36 ` [PATCH v2] media: atomisp: Fixed " Souptick Joarder
2020-12-08 19:48 ` Souptick Joarder
2020-12-29 7:48 ` Souptick Joarder
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