| From | Ben Hutchings <> | Date | Sat, 01 Nov 2014 22:28:03 +0000 | Subject | [PATCH 3.2 100/102] nfsd: Fix ACL null pointer deref |
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3.2.64-rc1 review patch. If anyone has any objections, please let me know.
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From: Sergio Gelato <Sergio.Gelato@astro.su.se>
BugLink: http://bugs.launchpad.net/bugs/1348670
Fix regression introduced in pre-3.14 kernels by cherry-picking aa07c713ecfc0522916f3cd57ac628ea6127c0ec (NFSD: Call ->set_acl with a NULL ACL structure if no entries).
The affected code was removed in 3.14 by commit 4ac7249ea5a0ceef9f8269f63f33cc873c3fac61 (nfsd: use get_acl and ->set_acl). The ->set_acl methods are already able to cope with a NULL argument.
Signed-off-by: Sergio Gelato <Sergio.Gelato@astro.su.se> [bwh: Rewrite the subject] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- fs/nfsd/vfs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 446dc01..fc208e4 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -508,6 +508,9 @@ char *buf = NULL; int error = 0; + if (!pacl) + return vfs_setxattr(dentry, key, NULL, 0, 0); + buflen = posix_acl_xattr_size(pacl->a_count); buf = kmalloc(buflen, GFP_KERNEL); error = -ENOMEM;
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