KASAN: use-after-free Read in rdma_resolve_addr

From: syzbot
Date: Wed Sep 26 2018 - 10:27:07 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 846e8dd47c26 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=113cfbfa400000
kernel config: https://syzkaller.appspot.com/x/.config?x=dfb440e26f0a6f6f
dashboard link: https://syzkaller.appspot.com/bug?extid=5013f86be1187ccf3800
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5013f86be1187ccf3800@xxxxxxxxxxxxxxxxxxxxxxxxx

binder: 12750:12764 transaction failed 29201/-71, size 0-8 line 2762
audit: type=1326 audit(1537939130.796:20382): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 ip=0x45a3da code=0x50000
==================================================================
BUG: KASAN: use-after-free in rdma_resolve_addr+0x1e97/0x2730 drivers/infiniband/core/cma.c:2981
Read of size 2 at addr ffff88018529b1e0 by task syz-executor2/12772

CPU: 1 PID: 12772 Comm: syz-executor2 Not tainted 4.19.0-rc5+ #254
audit: type=1326 audit(1537939130.846:20383): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
__asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
rdma_resolve_addr+0x1e97/0x2730 drivers/infiniband/core/cma.c:2981
audit: type=1326 audit(1537939130.846:20384): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 ip=0x45a3da code=0x50000
ucma_resolve_ip+0x242/0x2a0 drivers/infiniband/core/ucma.c:713
ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1686
audit: type=1326 audit(1537939130.866:20385): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=298 compat=0 ip=0x457579 code=0x50000
__vfs_write+0x119/0x9f0 fs/read_write.c:485
audit: type=1326 audit(1537939130.866:20386): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 ip=0x45a3da code=0x50000
vfs_write+0x1fc/0x560 fs/read_write.c:549
ksys_write+0x101/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
audit: type=1326 audit(1537939130.876:20387): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
audit: type=1326 audit(1537939130.876:20388): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
RSP: 002b:00007f451b87cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000009
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f451b87d6d4
R13: 00000000004cb6a0 R14: 00000000004d8cb8 R15: 00000000ffffffff

binder: BINDER_SET_CONTEXT_MGR already set
Allocated by task 12777:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
kmalloc include/linux/slab.h:513 [inline]
kzalloc include/linux/slab.h:707 [inline]
__rdma_create_id+0xdf/0x790 drivers/infiniband/core/cma.c:784
ucma_create_id+0x39b/0x990 drivers/infiniband/core/ucma.c:504
binder: 12750:12773 ioctl 40046207 0 returned -16
ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1686
__vfs_write+0x119/0x9f0 fs/read_write.c:485
vfs_write+0x1fc/0x560 fs/read_write.c:549
ksys_write+0x101/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

audit: type=1326 audit(1537939130.886:20389): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
Freed by task 12770:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3813
rdma_destroy_id+0x835/0xcc0 drivers/infiniband/core/cma.c:1739
ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1765
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
audit: type=1326 audit(1537939130.926:20390): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

audit: type=1326 audit(1537939130.926:20391): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12758 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457579 code=0x50000
The buggy address belongs to the object at ffff88018529b1c0
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 32 bytes inside of
2048-byte region [ffff88018529b1c0, ffff88018529b9c0)
The buggy address belongs to the page:
page:ffffea000614a680 count:1 mapcount:0 mapping:ffff8801da800c40 index:0xffff88018529a940
binder: 12750:12764 ERROR: BC_REGISTER_LOOPER called without request
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00061c4188 ffffea000632af08 ffff8801da800c40
raw: ffff88018529a940 ffff88018529a0c0 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff88018529b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88018529b100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc

ffff88018529b180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb

^
ffff88018529b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88018529b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
kobject: 'loop5' (000000002cf6e86e): kobject_uevent_env

---
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Next message: syzbot: "BUG: unable to handle kernel NULL pointer dereference in sha1_mb_mgr_get_comp_job_avx2"
Previous message: Rob Herring: "Re: [PATCH 1/2] dt-bindings: spi: fsl-lpspi: Option to allow stalling"
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