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-rw-r--r--meta/recipes-multimedia/alsa/alsa-lib/0001-ucm-Use-strncmp-to-avoid-access-out-of-boundary.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/meta/recipes-multimedia/alsa/alsa-lib/0001-ucm-Use-strncmp-to-avoid-access-out-of-boundary.patch b/meta/recipes-multimedia/alsa/alsa-lib/0001-ucm-Use-strncmp-to-avoid-access-out-of-boundary.patch
new file mode 100644
index 0000000000..96dcd8abac
--- /dev/null
+++ b/meta/recipes-multimedia/alsa/alsa-lib/0001-ucm-Use-strncmp-to-avoid-access-out-of-boundary.patch
@@ -0,0 +1,41 @@
1From 4b6fe372c68d1ff50e7c161cffadeb298734f49c Mon Sep 17 00:00:00 2001
2From: paulhsia <paulhsia@chromium.org>
3Date: Sat, 30 Nov 2019 03:35:30 +0800
4Subject: [PATCH 1/5] ucm: Use strncmp to avoid access-out-of-boundary
5
6If the length of the identifier is less than the length of the prefix,
7access-out-of-boundary will occur in memcmp().
8
9Signed-off-by: paulhsia <paulhsia@chromium.org>
10Signed-off-by: Jaroslav Kysela <perex@perex.cz>
11
12Upstream-Status: Backport
13Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
14---
15 src/ucm/main.c | 8 +++++---
16 1 file changed, 5 insertions(+), 3 deletions(-)
17
18diff --git a/src/ucm/main.c b/src/ucm/main.c
19index b0b6ffb3..252e50d9 100644
20--- a/src/ucm/main.c
21+++ b/src/ucm/main.c
22@@ -61,11 +61,13 @@ static int check_identifier(const char *identifier, const char *prefix)
23 {
24 int len;
25
26- if (strcmp(identifier, prefix) == 0)
27- return 1;
28 len = strlen(prefix);
29- if (memcmp(identifier, prefix, len) == 0 && identifier[len] == '/')
30+ if (strncmp(identifier, prefix, len) != 0)
31+ return 0;
32+
33+ if (identifier[len] == 0 || identifier[len] == '/')
34 return 1;
35+
36 return 0;
37 }
38
39--
402.20.1
41