| From 9fe3348299de0836cd025c65cee18c49e84b5838 Mon Sep 17 00:00:00 2001 |
| From: paulhsia <paulhsia@chromium.org> |
| Date: Fri, 29 Nov 2019 01:33:42 +0800 |
| Subject: [PATCH] ucm: Use strncmp to avoid access-out-of-boundary |
| |
| If the length of the identifier is less than the length of the prefix, |
| access-out-of-boundary will occur in memcmp(). |
| |
| Signed-off-by: paulhsia <paulhsia@chromium.org> |
| --- |
| src/ucm/main.c | 8 +++++--- |
| 1 file changed, 5 insertions(+), 3 deletions(-) |
| |
| diff --git a/src/ucm/main.c b/src/ucm/main.c |
| index 99b1cd08..c78f917a 100644 |
| --- a/src/ucm/main.c |
| +++ b/src/ucm/main.c |
| @@ -60,11 +60,13 @@ static int check_identifier(const char *identifier, const char *prefix) |
| { |
| int len; |
| |
| - if (strcmp(identifier, prefix) == 0) |
| - return 1; |
| len = strlen(prefix); |
| - if (memcmp(identifier, prefix, len) == 0 && identifier[len] == '/') |
| + if (strncmp(identifier, prefix, len) != 0) |
| + return 0; |
| + |
| + if (identifier[len] == 0 || identifier[len] == '/') |
| return 1; |
| + |
| return 0; |
| } |
| |
| -- |
| 2.24.0.393.g34dc348eaf-goog |
| |
