Milan Kyselica
c3c9cc7adb
Bound image dimensions before computing row_size to prevent overflow in the depth * x multiplication on 32-bit. Without this, crafted dimensions like depth=32 x=0x10000001 wrap to a small row_size that passes all subsequent checks. Reject channel masks where all bits are set (popcount == 32), since 1U << 32 is undefined behavior and causes division by zero on architectures where it evaluates to zero. Move the validation before computing derived values for clarity. Use unsigned 1U in shifts to avoid signed integer overflow UB for popcount == 31. Also reject zero-width and zero-height images. Fixes: https://github.com/systemd/systemd/issues/41589
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