Messages in this thread Patch in this message | | | From | David Howells <> | Subject | [PATCH] KEYS: Fix error handling in construct_key_and_link() | Date | Tue, 21 Jun 2011 14:32:05 +0100 |
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Fix error handling in construct_key_and_link(). If construct_alloc_key() returns an error, it shouldn't pass out through the normal path as the key_serial() called by the kleave() statement will oops when it gets an error code in the pointer:
BUG: unable to handle kernel paging request at ffffffffffffff84 IP: [<ffffffff8120b401>] request_key_and_link+0x4d7/0x52f PGD 1a05067 PUD 1a06067 PMD 0 Oops: 0000 [#1] SMP CPU 0 Modules linked in: cifs nls_utf8 fscache sunrpc ipx p8022 psnap llc p8023 rose ax25 joydev i2c_piix4 i2c_core virtio_balloon virtio_net virtio_blk [last unloaded: cifs]
Pid: 6888, comm: mount.cifs Not tainted 3.0-0.rc3.git5.1.fc16.x86_64 #1 Bochs Bochs RIP: 0010:[<ffffffff8120b401>] [<ffffffff8120b401>] request_key_and_link+0x4d7/0x52f RSP: 0018:ffff8800314fd9d8 EFLAGS: 00010282 RAX: ffffffffffffff00 RBX: ffffffffffffff80 RCX: 000000000000000a RDX: 0000000000000000 RSI: ffffffff81a59c90 RDI: ffff88003b2aa180 RBP: ffff8800314fda78 R08: 0000000000000002 R09: 0000000000000000 R10: 0000ffff00066c0a R11: 0000000000000001 R12: ffffffffa01017a0 R13: ffff88003b2aa180 R14: ffff880032525600 R15: ffffffff81a5a518 FS: 00007f8353a09740(0000) GS:ffff88003fa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffffffffffffff84 CR3: 000000003b821000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process mount.cifs (pid: 6888, threadinfo ffff8800314fc000, task ffff88003aa9c7a0) Stack: 0000000000000000 0000000000000000 0000000000000000 ffffffff8125be28 ffffffffa00ff5a7 0000000000000000 0000000000000000 ffffffff81a5a500 ffffffffa00ff5dd ffff8800326f7d68 ffffff8000000000 0000000000000000 Call Trace: [<ffffffff8125be28>] ? vsnprintf+0x3c5/0x401 [<ffffffff8120b52c>] request_key+0x41/0x75 [<ffffffffa00ed6e8>] cifs_get_spnego_key+0x206/0x226 [cifs] [<ffffffffa00eb0c9>] CIFS_SessSetup+0x511/0x1234 [cifs] [<ffffffff81085bea>] ? trace_hardirqs_off+0xd/0xf [<ffffffffa00d9799>] cifs_setup_session+0x90/0x1ae [cifs] [<ffffffffa00d9c02>] cifs_get_smb_ses+0x34b/0x40f [cifs] [<ffffffffa00d9e05>] cifs_mount+0x13f/0x504 [cifs] [<ffffffff81261e71>] ? __raw_spin_lock_init+0x31/0x52 [<ffffffffa00caabb>] cifs_do_mount+0xc4/0x672 [cifs] [<ffffffff810f08ea>] ? __free_pages+0x26/0x2f [<ffffffff810f093a>] ? free_pages+0x47/0x4c [<ffffffff81212829>] ? selinux_sb_copy_data+0x192/0x1ab [<ffffffff8113ae8c>] mount_fs+0x69/0x155 [<ffffffff81104750>] ? __alloc_percpu+0x10/0x12 [<ffffffff8114ff0e>] vfs_kern_mount+0x63/0xa0 [<ffffffff81150be2>] do_kern_mount+0x4d/0xdf [<ffffffff81152278>] do_mount+0x63c/0x69f [<ffffffff8115255c>] sys_mount+0x88/0xc2 [<ffffffff814fbdc2>] system_call_fastpath+0x16/0x1b
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> ---
security/keys/request_key.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 8e319a4..8246532 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -469,7 +469,7 @@ static struct key *construct_key_and_link(struct key_type *type, } else if (ret == -EINPROGRESS) { ret = 0; } else { - key = ERR_PTR(ret); + goto couldnt_alloc_key; } key_put(dest_keyring); @@ -479,6 +479,7 @@ static struct key *construct_key_and_link(struct key_type *type, construction_failed: key_negate_and_link(key, key_negative_timeout, NULL, NULL); key_put(key); +couldnt_alloc_key: key_put(dest_keyring); kleave(" = %d", ret); return ERR_PTR(ret);
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