fpga_mgr_test_img_load_sgt() allocates memory for sgt using kunit_kzalloc() however it does not check if the allocation failed. It then passes sgt to sg_alloc_table(), which passes it to __sg_alloc_table(). This function calls memset() on sgt in an attempt to zero it out. If the allocation fails then sgt will be NULL and the memset will trigger a NULL pointer dereference.
Fix this by checking the allocation with KUNIT_ASSERT_NOT_ERR_OR_NULL().
Fixes: ccbc1c302115 ("fpga: add an initial KUnit suite for the FPGA Manager") Cc: stable@vger.kernel.org Signed-off-by: Qasim Ijaz qasdev00@gmail.com --- drivers/fpga/tests/fpga-mgr-test.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/fpga/tests/fpga-mgr-test.c b/drivers/fpga/tests/fpga-mgr-test.c index 9cb37aefbac4..1902ebf5a298 100644 --- a/drivers/fpga/tests/fpga-mgr-test.c +++ b/drivers/fpga/tests/fpga-mgr-test.c @@ -263,6 +263,7 @@ static void fpga_mgr_test_img_load_sgt(struct kunit *test) img_buf = init_test_buffer(test, IMAGE_SIZE);
sgt = kunit_kzalloc(test, sizeof(*sgt), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); ret = sg_alloc_table(sgt, 1, GFP_KERNEL); KUNIT_ASSERT_EQ(test, ret, 0); sg_init_one(sgt->sgl, img_buf, IMAGE_SIZE);
On Wed, Mar 12, 2025 at 02:01:48PM +0100, Markus Elfring wrote:
…
zero it out. If the allocation fails then sgt will be NULL and the
… failed?
Can a summary phrase like “Prevent null pointer dereference in fpga_mgr_test_img_load_sgt()” be nicer?
Regards, Markus
Hi,
This is the semi-friendly patch-bot of Greg Kroah-Hartman.
Markus, you seem to have sent a nonsensical or otherwise pointless review comment to a patch submission on a Linux kernel developer mailing list. I strongly suggest that you not do this anymore. Please do not bother developers who are actively working to produce patches and features with comments that, in the end, are a waste of time.
Patch submitter, please ignore Markus's suggestion; you do not need to follow it at all. The person/bot/AI that sent it is being ignored by almost all Linux kernel maintainers for having a persistent pattern of behavior of producing distracting and pointless commentary, and inability to adapt to feedback. Please feel free to also ignore emails from them.
thanks,
greg k-h's patch email bot
On 2025-03-12 00:45, Qasim Ijaz wrote:
fpga_mgr_test_img_load_sgt() allocates memory for sgt using kunit_kzalloc() however it does not check if the allocation failed. It then passes sgt to sg_alloc_table(), which passes it to __sg_alloc_table(). This function calls memset() on sgt in an attempt to zero it out. If the allocation fails then sgt will be NULL and the memset will trigger a NULL pointer dereference.
Fix this by checking the allocation with KUNIT_ASSERT_NOT_ERR_OR_NULL().
Fixes: ccbc1c302115 ("fpga: add an initial KUnit suite for the FPGA Manager") Cc: stable@vger.kernel.org Signed-off-by: Qasim Ijaz qasdev00@gmail.com
Reviewed-by: Marco Pagani marco.pagani@linux.dev
drivers/fpga/tests/fpga-mgr-test.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/fpga/tests/fpga-mgr-test.c b/drivers/fpga/tests/fpga-mgr-test.c index 9cb37aefbac4..1902ebf5a298 100644 --- a/drivers/fpga/tests/fpga-mgr-test.c +++ b/drivers/fpga/tests/fpga-mgr-test.c @@ -263,6 +263,7 @@ static void fpga_mgr_test_img_load_sgt(struct kunit *test) img_buf = init_test_buffer(test, IMAGE_SIZE); sgt = kunit_kzalloc(test, sizeof(*sgt), GFP_KERNEL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); ret = sg_alloc_table(sgt, 1, GFP_KERNEL); KUNIT_ASSERT_EQ(test, ret, 0); sg_init_one(sgt->sgl, img_buf, IMAGE_SIZE);
Thanks, Marco
linux-stable-mirror@lists.linaro.org
-
Greg KH -
Marco Pagani -
Markus Elfring -
Qasim Ijaz