Messages in this thread Patch in this message | | | Subject | [PATCH] Fix panic in 2.6 with bounced bio and dm | From | Mark Haverkamp <> | Date | Fri, 25 Feb 2005 09:03:41 -0800 |
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Last September a fix was checked in for a memory leak problem in bounce_end_io causing the entire bio to be checked. This ended up causing some dm cloned bios that had bounce buffers to free NULL pages because their bi_idx can be non-zero. This patch skips NULL pages in the bio's bio_vec. I'm not sure if this is the most optimal fix but I think that it is safe since bvec_alloc memsets the bio_vec to zero.
Mark.
===== mm/highmem.c 1.55 vs edited ===== --- 1.55/mm/highmem.c 2005-01-07 21:44:13 -08:00 +++ edited/mm/highmem.c 2005-02-25 07:54:21 -08:00 @@ -319,7 +319,7 @@ */ __bio_for_each_segment(bvec, bio, i, 0) { org_vec = bio_orig->bi_io_vec + i; - if (bvec->bv_page == org_vec->bv_page) + if (!bvec->bv_page || bvec->bv_page == org_vec->bv_page) continue; mempool_free(bvec->bv_page, pool); -- Mark Haverkamp <markh@osdl.org>
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