Jeremy Cline eb8ca93e49
drm/amdkfd: Fix out-of-bounds read in kdf_create_vcrat_image_cpu() ...
[ Upstream commit 8b335bff643f3b39935c7377dbcd361c5b605d98 ]
KASAN reported a slab-out-of-bounds read of size 1 in
kdf_create_vcrat_image_cpu().
This occurs when, for example, when on an x86_64 with a single NUMA node
because kfd_fill_iolink_info_for_cpu() is a no-op, but afterwards the
sub_type_hdr->length, which is out-of-bounds, is read and multiplied by
entries. Fortunately, entries is 0 in this case so the overall
crat_table->length is still correct.
Check if there were any entries before de-referencing sub_type_hdr which
may be pointing to out-of-bounds memory.
Fixes: b7b6c38529Felix.Kuehling@amd.com >
Signed-off-by: Jeremy Cline <jcline@redhat.com >
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com >
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com >
Signed-off-by: Alex Deucher <alexander.deucher@amd.com >
Signed-off-by: Sasha Levin <sashal@kernel.org >
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eb8ca93e49