This patch fixes the following bug:
BUG: unable to handle kernel paging request at fffffffffffffffe
IP: [<ffffffff8032e80e>] strcmp+0x5/0x19
PGD 203067 PUD 204067 PMD 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/kernel/perfmon/version
CPU 7
Modules linked in:
Pid: 5135, comm: ibs_sampling Not tainted
2.6.28-perfmon-x86_64-standard-00431-gec92131 #1
RIP: 0010:[<ffffffff8032e80e>] [<ffffffff8032e80e>] strcmp+0x5/0x19
RSP: 0018:ffff88042f1d1e60 EFLAGS: 00010287
RAX: 0000000000000064 RBX: ffffffff807430e0 RCX: ffff88042f1d1f10
RDX: 0000000000000064 RSI: fffffffffffffffe RDI: ffffffff806b37b4
RBP: fffffffffffffffe R08: ffff88042f1d1f10 R09: 0000000000000000
R10: 00007fc1561cc6f0 R11: 0000000000000206 R12: 00007fc1561cc6f0
R13: 0000000000000000 R14: ffff88042f1d1f18 R15: 0000000000000040
FS: 00007fc1561cc6f0(0000) GS:ffff88042f99df40(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: fffffffffffffffe CR3: 000000042d990000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process ibs_sampling (pid: 5135, threadinfo ffff88042f1d0000, task
ffff88042fb5d8d0)
Stack:
ffffffff803299c4 ffff88042f1d1f10 fffffffffffffffe 00007fc1561cc6f0
ffffffff80329a05 fffffffffffffffe ffffffff80328501 ffff88042db0d1e0
ffff88042f1d1f10 ffff88042f1d1f08 00007fff5e1d2110 00007fff5e1d1fc0
Call Trace:
[<ffffffff803299c4>] ? pfm_find_fmt+0x2c/0x55
[<ffffffff80329a05>] ? pfm_smpl_fmt_get+0x18/0x5c
[<ffffffff80328501>] ? pfm_get_smpl_arg+0x84/0x1c7
[<ffffffff803224a6>] ? sys_pfm_create_context+0xcd/0x109
[<ffffffff802652ed>] ? do_munmap+0x298/0x2b3
[<ffffffff8020b20b>] ? system_call_fastpath+0x16/0x1b
Code: 14 08 72 04 0f 0b eb fe 4d 29 c1 4d 01 c2 49 8d 41 ff 4c 39 c9 4c 89 d7
fc 48 0f 43 c8 48 89 d0 f3 a4 c6 07 00 c3 0f b6 17 89 d0 <2a> 06 48 ff c6 84 c0
75 07 48 ff c7 84 d2 75 eb 0f be c0 c3 31
RIP [<ffffffff8032e80e>] strcmp+0x5/0x19
RSP <ffff88042f1d1e60>
CR2: fffffffffffffffe
---[ end trace 548f9728b73203d7 ]---
Signed-off-by: Robert Richter <robert.rich...@amd.com>
---
perfmon/perfmon_smpl.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/perfmon/perfmon_smpl.c b/perfmon/perfmon_smpl.c
index e31fb15..a6e26d7 100644
--- a/perfmon/perfmon_smpl.c
+++ b/perfmon/perfmon_smpl.c
@@ -811,9 +811,10 @@ int pfm_get_smpl_arg(char __user *fmt_uname, void __user
*fmt_uarg, size_t usize
int ret;
fmt_name = getname(fmt_uname);
- if (!fmt_name) {
- PFM_DBG("getname failed");
- return -ENOMEM;
+ ret = PTR_ERR(fmt_name);
+ if (IS_ERR(fmt_name)) {
+ PFM_DBG("getname failed: %d", ret);
+ return ret;
}
/*
--
1.6.1
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