Re: [PATCH v2] efifb: prevent null-deref when iterating dmi_list
From: David Herrmann <hidden>
Date: 2013-10-31 16:17:57
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Hi On Thu, Oct 31, 2013 at 11:45 AM, Jean-Christophe PLAGNIOL-VILLARD [off-list ref] wrote:
On 18:40 Wed 02 Oct , David Herrmann wrote:quoted
The dmi_list array is initialized using gnu designated initializers, and therefore may contain fewer explicitly defined entries as there are elements in it. This is because the enum above with M_xyz constants contains more items than the designated initializer. Those elements not explicitly initialized are implicitly set to 0. Now efifb_setup() loops through all these array elements, and performs a strcmp on each item. For non explicitly initialized elements this will be a null pointer: This patch swaps the check order in the if statement, thus checks first whether dmi_list[i].base is null. Signed-off-by: James Bates <redacted> Signed-off-by: David Herrmann <redacted>with the simpleDRM arriving next merge I'm wondering if we need to keep it?
SimpleDRM is not coming next merge-window. It's basically finished, but I'm still working on the user-space side as its KMS api is highly reduced compared to fully-featured DRM/KMS drivers. Maybe 3.13 will work out. Anyhow, this patch is still needed as it fixes a serious bug for simplefb. Thanks David