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d95cfa31cb
[ Upstream commit da48bc4461b8a5ebfb9264c9b191a701d8e99009 ]
[Why & How]
dal_vector_reserve() computes the allocation size as
"capacity * vector->struct_size" using uint32_t arithmetic, which can
silently wrap to a small value on overflow. This would cause krealloc to
return a smaller buffer than expected, leading to heap overflows on
subsequent vector appends.
Replace krealloc() with krealloc_array() which performs an internal
overflow check and returns NULL on wrap, preventing the issue.
Fixes: 2004f45ef8 ("drm/amd/display: Use kernel alloc/free")
Assisted-by: Copilot:claude-opus-4.6
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 37668568641ccc4cc1dbca4923d0a16609dd5707)
Cc: stable@vger.kernel.org
[ changed `krealloc_array(p, capacity, struct_size)` to `krealloc(p, array_size(capacity, struct_size))` since krealloc_array() is absent in 5.10 ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>