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| author | Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com> | 2010-11-28 19:46:50 -0200 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2010-12-06 17:19:13 -0500 |
| commit | 8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f (patch) | |
| tree | e0d21c1bf4b70e4edf318985a9a56c365ac62a5a /drivers/platform/x86/wmi.c | |
| parent | 53c96dfdd0c0ccbba7aee84c60ce0f2aa466413f (diff) | |
| download | linux-8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f.tar.gz linux-8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f.tar.bz2 linux-8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f.zip | |
wmi: use memcmp instead of strncmp to compare GUIDs
While looking for the duplicates in /sys/class/wmi/, I couldn't find
them. The code that looks for duplicates uses strncmp in a binary GUID,
which may contain zero bytes. The right function is memcmp, which is
also used in another section of wmi code.
It was finding 49142400-C6A3-40FA-BADB-8A2652834100 as a duplicate of
39142400-C6A3-40FA-BADB-8A2652834100. Since the first byte is the fourth
printed, they were found as equal by strncmp.
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 104b77c87ef5..aecd9a9b549f 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -755,7 +755,7 @@ static bool guid_already_parsed(const char *guid_string) struct wmi_block *wblock; list_for_each_entry(wblock, &wmi_block_list, list) - if (strncmp(wblock->gblock.guid, guid_string, 16) == 0) + if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) return true; return false; |