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[ Upstream commitaf90a8f4a0] Check 'ix' before it is used. Fixes:80e675f906("ext4: optimize memmmove lengths in extent/index insertions") Signed-off-by: Gou Hao <gouhao@uniontech.com> Link: https://lore.kernel.org/r/20230906013341.7199-1-gouhao@uniontech.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <sashal@kernel.org>