| Date | Fri, 30 Mar 2012 12:50:08 -0700 | From | Greg KH <> | Subject | [ 095/149] UBI: fix error handling in ubi_scan() |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Richard Weinberger <richard@nod.at>
commit a29852be492d61001d86c6ebf5fff9b93d7b4be9 upstream.
Two bad things can happen in ubi_scan(): 1. If kmem_cache_create() fails we jump to out_si and call ubi_scan_destroy_si() which calls kmem_cache_destroy(). But si->scan_leb_slab is NULL. 2. If process_eb() fails we jump to out_vidh, call kmem_cache_destroy() and ubi_scan_destroy_si() which calls again kmem_cache_destroy().
Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/mtd/ubi/scan.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/mtd/ubi/scan.c +++ b/drivers/mtd/ubi/scan.c @@ -1174,7 +1174,7 @@ struct ubi_scan_info *ubi_scan(struct ub ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); if (!ech) - goto out_slab; + goto out_si; vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); if (!vidh) @@ -1235,8 +1235,6 @@ out_vidh: ubi_free_vid_hdr(ubi, vidh); out_ech: kfree(ech); -out_slab: - kmem_cache_destroy(si->scan_leb_slab); out_si: ubi_scan_destroy_si(si); return ERR_PTR(err); @@ -1325,7 +1323,9 @@ void ubi_scan_destroy_si(struct ubi_scan } } - kmem_cache_destroy(si->scan_leb_slab); + if (si->scan_leb_slab) + kmem_cache_destroy(si->scan_leb_slab); + kfree(si); }
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