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author | Borislav Petkov <bp@suse.de> | 2019-04-20 12:53:05 +0200 |
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committer | Borislav Petkov <bp@suse.de> | 2019-06-08 17:32:00 +0200 |
commit | 6d8e294bf5f0e85c34e8b14b064e2965f53f38b0 (patch) | |
tree | 11867f8240f9cad95ff4b37a4d7758104c79da1b | |
parent | 0ade0b6240c4853cf9725924c46c10f4251639d7 (diff) | |
download | linux-stable-6d8e294bf5f0e85c34e8b14b064e2965f53f38b0.tar.gz linux-stable-6d8e294bf5f0e85c34e8b14b064e2965f53f38b0.tar.bz2 linux-stable-6d8e294bf5f0e85c34e8b14b064e2965f53f38b0.zip |
RAS/CEC: Fix pfn insertion
When inserting random PFNs for debugging the CEC through
(debugfs)/ras/cec/pfn, depending on the return value of pfn_set(),
multiple values get inserted per a single write.
That is because simple_attr_write() interprets a retval of 0 as
success and claims the whole input. However, pfn_set() returns the
cec_add_elem() value, which, if > 0 and smaller than the whole input
length, makes glibc continue issuing the write syscall until there's
input left:
pfn_set
simple_attr_write
debugfs_attr_write
full_proxy_write
vfs_write
ksys_write
do_syscall_64
entry_SYSCALL_64_after_hwframe
leading to those repeated calls.
Return 0 to fix that.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
-rw-r--r-- | drivers/ras/cec.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c index 673f8a128397..f5795adc5a6e 100644 --- a/drivers/ras/cec.c +++ b/drivers/ras/cec.c @@ -369,7 +369,9 @@ static int pfn_set(void *data, u64 val) { *(u64 *)data = val; - return cec_add_elem(val); + cec_add_elem(val); + + return 0; } DEFINE_DEBUGFS_ATTRIBUTE(pfn_ops, u64_get, pfn_set, "0x%llx\n"); |