David Howells 29f0698532 afs: Fix AFS read bug ... Fix a bug in AFS read whereby the request page afs_read::index isn't incremented after calling ->page_done() if ->remain reaches 0, indicating that the data read is complete. Without this a NULL pointer exception happens when ->page_done() is called twice for the last page because the page clearing loop will call it also and afs_readpages_page_done() clears the current entry in the page list. BUG: unable to handle kernel NULL pointer dereference at (null) IP: afs_readpages_page_done+0x21/0xa4 [kafs] PGD 0 Oops: 0002 [#1] SMP Modules linked in: kafs(E) CPU: 2 PID: 3002 Comm: md5sum Tainted: G E 4.10.0-fscache #485 Hardware name: ASUS All Series/H97-PLUS, BIOS 2306 10/09/2014 task: ffff8804017d86c0 task.stack: ffff8803fc1d8000 RIP: 0010:afs_readpages_page_done+0x21/0xa4 [kafs] RSP: 0018:ffff8803fc1db978 EFLAGS: 00010282 RAX: ffff880405d39af8 RBX: 0000000000000000 RCX: ffff880407d83ed4 RDX: 0000000000000000 RSI: ffff880405d39a00 RDI: ffff880405c6f400 RBP: ffff8803fc1db988 R08: 0000000000000000 R09: 0000000000000001 R10: ffff8803fc1db820 R11: ffff88040cf56000 R12: ffff8804088f1780 R13: ffff8804017d86c0 R14: ffff8804088f1780 R15: 0000000000003840 FS: 00007f8154469700(0000) GS:ffff88041fb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000004016ec000 CR4: 00000000001406e0 Call Trace: afs_deliver_fs_fetch_data+0x5b9/0x60e [kafs] ? afs_make_call+0x316/0x4e8 [kafs] ? afs_make_call+0x359/0x4e8 [kafs] afs_deliver_to_call+0x173/0x2e8 [kafs] ? afs_make_call+0x316/0x4e8 [kafs] afs_make_call+0x37a/0x4e8 [kafs] ? wake_up_q+0x4f/0x4f ? __init_waitqueue_head+0x36/0x49 afs_fs_fetch_data+0x21c/0x227 [kafs] ? afs_fs_fetch_data+0x21c/0x227 [kafs] afs_vnode_fetch_data+0xf3/0x1d2 [kafs] afs_readpages+0x314/0x3fd [kafs] __do_page_cache_readahead+0x208/0x2c5 ondemand_readahead+0x3a2/0x3b7 ? ondemand_readahead+0x3a2/0x3b7 page_cache_async_readahead+0x5e/0x67 generic_file_read_iter+0x23b/0x70c ? __inode_security_revalidate+0x2f/0x62 __vfs_read+0xc4/0xe8 vfs_read+0xd1/0x15a SyS_read+0x4c/0x89 do_syscall_64+0x80/0x191 entry_SYSCALL64_slow_path+0x25/0x25 Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marc Dionne <marc.dionne@auristor.com>		2017-03-16 16:27:46 +00:00
..
afs_cm.h
afs_fs.h
afs_vl.h	AFS: Fix silly characters in a comment	2011-07-20 20:48:03 -04:00
afs.h	afs: Support interacting with multiple user namespaces	2013-02-13 06:00:51 -08:00
cache.c
callback.c	afs: Migrate vlocation fields to 64-bit	2017-03-16 16:27:46 +00:00
cell.c	FS-Cache: Provide the ability to enable/disable cookies	2013-09-27 18:40:25 +01:00
cmservice.c	afs: Deal with an empty callback array	2017-03-16 16:27:44 +00:00
dir.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
file.c	afs: Flush outstanding writes when an fd is closed	2017-03-16 16:27:45 +00:00
flock.c	fs/afs/flock: Remove deprecated create_singlethread_workqueue	2016-09-04 21:41:39 +01:00
fsclient.c	afs: Fix AFS read bug	2017-03-16 16:27:46 +00:00
inode.c	afs: Prevent callback expiry timer overflow	2017-03-16 16:27:46 +00:00
internal.h	afs: Prevent callback expiry timer overflow	2017-03-16 16:27:46 +00:00
Kconfig	fs/afs: remove depends on CONFIG_EXPERIMENTAL	2013-01-21 14:39:04 -08:00
main.c	afs: Use core kernel UUID generation	2017-02-10 16:34:17 +00:00
Makefile
misc.c	kafs: Add more "unified AFS" error codes	2015-04-01 21:36:15 +01:00
mntpt.c	afs: Distinguish mountpoints from symlinks by file mode alone	2017-03-16 16:27:45 +00:00
netdevices.c	afs: Use core kernel UUID generation	2017-02-10 16:34:17 +00:00
proc.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
rxrpc.c	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-03-03 10:16:38 -08:00
security.c	afs: security: Replace rcu_assign_pointer() with RCU_INIT_POINTER()	2017-03-16 16:27:45 +00:00
server.c	afs: Migrate vlocation fields to 64-bit	2017-03-16 16:27:46 +00:00
super.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
vlclient.c	afs: Kill afs_wait_mode	2017-01-09 11:10:02 +00:00
vlocation.c	afs: Migrate vlocation fields to 64-bit	2017-03-16 16:27:46 +00:00
vnode.c	afs: Kill afs_wait_mode	2017-01-09 11:10:02 +00:00
volume.c	afs: Make afs_readpages() fetch data in bulk	2017-01-06 16:54:41 +00:00
write.c	afs: Flush outstanding writes when an fd is closed	2017-03-16 16:27:45 +00:00