This is a note to let you know that I've just added the patch titled
staging: ion: Prevent incorrect reference counting behavour to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: staging-ion-prevent-incorrect-reference-counting-behavour.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <sta...@vger.kernel.org> know about it. >From lee.jo...@linaro.org Sat Nov 27 12:56:17 2021 From: Lee Jones <lee.jo...@linaro.org> Date: Fri, 26 Nov 2021 10:33:35 +0000 Subject: staging: ion: Prevent incorrect reference counting behavour To: lee.jo...@linaro.org Cc: de...@driverdev.osuosl.org, a...@android.com, sta...@vger.kernel.org, riandr...@android.com, labb...@redhat.com, sumit.sem...@linaro.org, Dan Carpenter <dan.carpen...@oracle.com> Message-ID: <20211126103335.880816-1-lee.jo...@linaro.org> From: Lee Jones <lee.jo...@linaro.org> Supply additional checks in order to prevent unexpected results. Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf") Suggested-by: Dan Carpenter <dan.carpen...@oracle.com> Signed-off-by: Lee Jones <lee.jo...@linaro.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/staging/android/ion/ion.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -606,6 +606,9 @@ static void *ion_buffer_kmap_get(struct void *vaddr; if (buffer->kmap_cnt) { + if (buffer->kmap_cnt == INT_MAX) + return ERR_PTR(-EOVERFLOW); + buffer->kmap_cnt++; return buffer->vaddr; } @@ -626,6 +629,9 @@ static void *ion_handle_kmap_get(struct void *vaddr; if (handle->kmap_cnt) { + if (handle->kmap_cnt == INT_MAX) + return ERR_PTR(-EOVERFLOW); + handle->kmap_cnt++; return buffer->vaddr; } Patches currently in stable-queue which might be from lee.jo...@linaro.org are queue-4.4/staging-ion-prevent-incorrect-reference-counting-behavour.patch _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel