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846bda1478
[ Upstream commit5634c8cb29] The current iosys_map_clear() implementation reads the potentially uninitialized 'is_iomem' boolean field to decide which union member to clear. This causes undefined behavior when called on uninitialized structures, as 'is_iomem' may contain garbage values like 0xFF. UBSAN detects this as: UBSAN: invalid-load in include/linux/iosys-map.h:267 load of value 255 is not a valid value for type '_Bool' Fix by unconditionally clearing the entire structure with memset(), eliminating the need to read uninitialized data and ensuring all fields are set to known good values. Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14639 Fixes:01fd30da04("dma-buf: Add struct dma-buf-map for storing struct dma_buf.vaddr_ptr") Signed-off-by: Nitin Gote <nitin.r.gote@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/r/20250718105051.2709487-1-nitin.r.gote@intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>