md/raid1: r1buf_pool_alloc: free allocate pages when subsequent allocation fails.
When performing a user-request check/repair (MD_RECOVERY_REQUEST is set) on a raid1, we allocate multiple bios each with their own set of pages. If the page allocations for one bio fails, we currently do *not* free the pages allocated for the previous bios, nor do we free the bio itself. This patch frees all the already-allocate pages, and makes sure that all the bios are freed as well. This bug can cause a memory leak which can ultimately OOM a machine. It was introduced in 3.10-rc1. Fixes: a0787606 Cc: Kent Overstreet <koverstreet@google.com> Cc: stable@vger.kernel.org (3.10+) Reported-by: NRussell King - ARM Linux <linux@arm.linux.org.uk> Signed-off-by: NNeilBrown <neilb@suse.de>
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