[lustre-devel] [PATCH 14/22] lustre: clio: append to non-existent component

[James Simmons <jsimmons@infradead.org>]

From: Vitaly Fertman <vitaly.fertman@hpe.com>

should return an error, but it fails now with a BUG below
because @rc of lov_io_layout_at() is not checked for < 0

BUG: unable to handle kernel paging request at ffff99d3c2f74030
    Call Trace:
      lov_stripe_number+0x19/0x40 [lov]
      lov_page_init_composite+0x103/0x5f0 [lov]
      ? kmem_cache_alloc+0x12e/0x270
      cl_page_alloc+0x19f/0x660 [obdclass]
      cl_page_find+0x1a0/0x250 [obdclass]
      ll_write_begin+0x1f7/0xfb0 [lustre]

HPE-bug-id: LUS-11075
WC-bug-id: https://jira.whamcloud.com/browse/LU-16281
Lustre-commit: 8fdeca3b6faf22c72 ("LU-16281 clio: append to non-existent component")
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Reviewed-on: https://es-gerrit.dev.cray.com/161123
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48994
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander <alexander.boyko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
 fs/lustre/lov/lov_page.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/lustre/lov/lov_page.c b/fs/lustre/lov/lov_page.c
index a22b71f..6e28e62 100644
--- a/fs/lustre/lov/lov_page.c
+++ b/fs/lustre/lov/lov_page.c
@@ -84,6 +84,8 @@ int lov_page_init_composite(const struct lu_env *env, struct cl_object *obj,
 		suboff = lio->lis_cached_suboff + offset - lio->lis_cached_off;
 	} else {
 		entry = lov_io_layout_at(lio, offset);
+		if (entry < 0)
+			return -ENODATA;
 
 		stripe = lov_stripe_number(loo->lo_lsm, entry, offset);
 		rc = lov_stripe_offset(loo->lo_lsm, entry, offset, stripe,
-- 
1.8.3.1

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