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reiserfs: Check the return value from __getblk()
[ Upstream commit ba38980 ] __getblk() can return a NULL pointer if we run out of memory or if we try to access beyond the end of the device; check it and handle it appropriately. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lore.kernel.org/lkml/CAFcO6XOacq3hscbXevPQP7sXRoYFz34ZdKPYjmd6k5sZuhGFDw@mail.gmail.com/ Tested-by: butt3rflyh4ck <butterflyhuangxx@gmail.com> Fixes: 1da177e ("Linux-2.6.12-rc2") # probably introduced in 2002 Acked-by: Edward Shishkin <edward.shishkin@gmail.com> Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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