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NFS client bugfix for 3.11

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- Stable patch to fix a highmem-related data corruption issue on 32-bit
   ARM platforms
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Merge tag 'nfs-for-3.11-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfix from Trond Myklebust:
 "Stable patch to fix a highmem-related data corruption issue on 32-bit
  ARM platforms"

* tag 'nfs-for-3.11-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: Fix memory corruption issue on 32-bit highmem systems
This commit is contained in:
Linus Torvalds 2013-08-29 17:00:40 -07:00
commit 06a557f7a6
1 changed files with 6 additions and 3 deletions
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9
net/sunrpc/xdr.c
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@ -207,10 +207,13 @@ _shift_data_right_pages(struct page **pages, size_t pgto_base,
pgfrom_base -= copy;
vto = kmap_atomic(*pgto);
vfrom = kmap_atomic(*pgfrom);
memmove(vto + pgto_base, vfrom + pgfrom_base, copy);
if (*pgto != *pgfrom) {
vfrom = kmap_atomic(*pgfrom);
memcpy(vto + pgto_base, vfrom + pgfrom_base, copy);
kunmap_atomic(vfrom);
} else
memmove(vto + pgto_base, vto + pgfrom_base, copy);
flush_dcache_page(*pgto);
kunmap_atomic(vfrom);
kunmap_atomic(vto);
} while ((len -= copy) != 0);