From: Leon Romanovsky <leonro@xxxxxxxxxx>
The user_entry_size is supplied by the user and later used as a
denominator to calculate number of entries. The zero supplied by
the user will trigger the following divide-by-zero error:
divide error: 0000 [#1] SMP KASAN PTI
CPU: 4 PID: 497 Comm: c_repro Not tainted 5.13.0-rc1+ #281
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
RIP: 0010:ib_uverbs_handler_UVERBS_METHOD_QUERY_GID_TABLE+0x1b1/0x510
Code: 87 59 03 00 00 e8 9f ab 1e ff 48 8d bd a8 00 00 00 e8 d3 70 41 ff 44 0f b7 b5 a8 00 00 00 e8 86 ab 1e ff 31 d2 4c 89 f0 31 ff <49> f7 f5 48 89 d6 48 89 54 24 10 48 89 04 24 e8 1b ad 1e ff 48 8b
RSP: 0018:ffff88810416f828 EFLAGS: 00010246
RAX: 0000000000000008 RBX: 1ffff1102082df09 RCX: ffffffff82183f3d
RDX: 0000000000000000 RSI: ffff888105f2da00 RDI: 0000000000000000
RBP: ffff88810416fa98 R08: 0000000000000001 R09: ffffed102082df5f
R10: ffff88810416faf7 R11: ffffed102082df5e R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff88810416faf0
FS: 00007f5715efa740(0000) GS:ffff88811a700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000840 CR3: 000000010c2e0001 CR4: 0000000000370ea0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
? ib_uverbs_handler_UVERBS_METHOD_INFO_HANDLES+0x4b0/0x4b0
? __radix_tree_lookup+0x190/0x190
? write_comp_data+0x2a/0x80
? __sanitizer_cov_trace_pc+0x1d/0x50
? __bitmap_subset+0x9a/0x130
ib_uverbs_cmd_verbs+0x1546/0x1940
? __kernel_text_address+0xe/0x30
? ib_uverbs_handler_UVERBS_METHOD_INFO_HANDLES+0x4b0/0x4b0
? uverbs_fill_udata+0x510/0x510
? putname+0xa8/0xc0
? kasan_set_free_info+0x20/0x30
? __kasan_slab_free+0xed/0x130
? kmem_cache_free+0x94/0x410
? putname+0xa8/0xc0
? do_sys_openat2+0x477/0x780
? do_sys_open+0xc8/0x150
? __sanitizer_cov_trace_pc+0x1d/0x50
? restore_nameidata+0x8a/0xb0
? __sanitizer_cov_trace_pc+0x1d/0x50
? do_filp_open+0x166/0x1f0
? should_fail+0x78/0x2a0
? may_open_dev+0x80/0x80
? write_comp_data+0x2a/0x80
? __sanitizer_cov_trace_pc+0x1d/0x50
ib_uverbs_ioctl+0x186/0x240
? ib_uverbs_cmd_verbs+0x1940/0x1940
? fsnotify+0xba0/0xba0
? write_comp_data+0x2a/0x80
? write_comp_data+0x2a/0x80
? ib_uverbs_cmd_verbs+0x1940/0x1940
__x64_sys_ioctl+0x38a/0x1220
? generic_block_fiemap+0x60/0x60
? putname+0xa8/0xc0
? __sanitizer_cov_trace_pc+0x1d/0x50
? do_sys_openat2+0x47c/0x780
? file_open_root+0x420/0x420
? __sanitizer_cov_trace_pc+0x1d/0x50
? cgroup_rstat_updated+0x66/0x1a0
? do_sys_open+0xc8/0x150
? filp_open+0x80/0x80
? write_comp_data+0x2a/0x80
? fpregs_assert_state_consistent+0x90/0xa0
? __sanitizer_cov_trace_pc+0x1d/0x50
? exit_to_user_mode_prepare+0x35/0x160
do_syscall_64+0x3f/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5715ff0f59
Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd33031858 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5715ff0f59
RDX: 0000000020000180 RSI: 00000000c0181b01 RDI: 0000000000000003
RBP: 00007ffd33031870 R08: 00007ffd33031950 R09: 00007ffd33031950
R10: 0000000000000000 R11: 0000000000000213 R12: 0000558a0989b060
R13: 00007ffd33031950 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 7776f38b0b269133 ]---
RIP: 0010:ib_uverbs_handler_UVERBS_METHOD_QUERY_GID_TABLE+0x1b1/0x510
Code: 87 59 03 00 00 e8 9f ab 1e ff 48 8d bd a8 00 00 00 e8 d3 70 41 ff 44 0f b7 b5 a8 00 00 00 e8 86 ab 1e ff 31 d2 4c 89 f0 31 ff <49> f7 f5 48 89 d6 48 89 54 24 10 48 89 04 24 e8 1b ad 1e ff 48 8b
RSP: 0018:ffff88810416f828 EFLAGS: 00010246
RAX: 0000000000000008 RBX: 1ffff1102082df09 RCX: ffffffff82183f3d
RDX: 0000000000000000 RSI: ffff888105f2da00 RDI: 0000000000000000
RBP: ffff88810416fa98 R08: 0000000000000001 R09: ffffed102082df5f
R10: ffff88810416faf7 R11: ffffed102082df5e R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff88810416faf0
FS: 00007f5715efa740(0000) GS:ffff88811a700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000840 CR3: 000000010c2e0001 CR4: 0000000000370ea0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 1 seconds..
Fixes: 9f85cbe50aa0 ("RDMA/uverbs: Expose the new GID query API to user space")
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
drivers/infiniband/core/uverbs_std_types_device.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_std_types_device.c b/drivers/infiniband/core/uverbs_std_types_device.c
index 9ec6971056fa..a03021d94e11 100644
--- a/drivers/infiniband/core/uverbs_std_types_device.c
+++ b/drivers/infiniband/core/uverbs_std_types_device.c
@@ -331,6 +331,9 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QUERY_GID_TABLE)(
if (ret)
return ret;
+ if (!user_entry_size)
+ return -EINVAL;
+
max_entries = uverbs_attr_ptr_get_array_size(
attrs, UVERBS_ATTR_QUERY_GID_TABLE_RESP_ENTRIES,
user_entry_size);
--
2.31.1
