nfs: fix memory leak in nfs_get_sb with CONFIG_NFS_V4
With CONFIG_NFS_V4 and data version 4, nfs_get_sb will allocate memory for export_path in nfs4_validate_text_mount_data, so we need to free it then. This is addressed in following kmemleak report: unreferenced object 0xffff88016bf48a50 (size 16): comm "mount.nfs", pid 22567, jiffies 4651574704 (age 175471.200s) hex dump (first 16 bytes): 2f 6f 70 74 2f 77 6f 72 6b 00 6b 6b 6b 6b 6b a5 /opt/work.kkkkk. backtrace: [<ffffffff814b34f9>] kmemleak_alloc+0x60/0xa7 [<ffffffff81102c76>] kmemleak_alloc_recursive.clone.5+0x1b/0x1d [<ffffffff811046b3>] __kmalloc_track_caller+0x18f/0x1b7 [<ffffffff810e1b08>] kstrndup+0x37/0x54 [<ffffffffa0336971>] nfs_parse_devname+0x152/0x204 [nfs] [<ffffffffa0336af3>] nfs4_validate_text_mount_data+0xd0/0xdc [nfs] [<ffffffffa0338deb>] nfs_get_sb+0x325/0x736 [nfs] [<ffffffff81113671>] vfs_kern_mount+0xbd/0x17c [<ffffffff81113798>] do_kern_mount+0x4d/0xed [<ffffffff81129a87>] do_mount+0x787/0x7fe [<ffffffff81129b86>] sys_mount+0x88/0xc2 [<ffffffff81009b42>] system_call_fastpath+0x16/0x1b Signed-off-by:Xiaotian Feng <dfeng@redhat.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Benny Halevy <bhalevy@panasas.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Andy Adamson <andros@netapp.com> Signed-off-by:
Trond Myklebust <Trond.Myklebust@netapp.com>
parent
acf82b85
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