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authorLi Xiaoming <lixm.fnst@cn.fujitsu.com>2019-08-21 16:53:37 +0800
committerJan-Simon Moeller <jsmoeller@linuxfoundation.org>2019-08-22 11:15:26 +0000
commit1eab9326969b3c56a233f4285bb716a3939a703f (patch)
treecbb24100541a5e93dadfbddc7d49a97661e339b9 /tsutils/tsutils.c
parent94122a8f011fc629662931072aeb411f38f96e4a (diff)
Remove potential overflow risk & improve indent
The patch below does: 1) As d_name type may hold 255(NAME_MAX) characters at most, so I enlarge the array length to include the proper size. maxX and maxY are s32(int32) type(-2,147,483,648 ~ +2,147,483,647), which will cost 11 characters at most when writing to the arrary. Also silence the warning. 2) Replace sprintf with snprintf, a safer version; 3) Improve indent; 4) Remove debug sentence. Bug-AGL: SPEC-2422 Change-Id: I6d83a92a3138decd2bc9b750b9659d581a9f1b6b Signed-off-by: Li Xiaoming <lixm.fnst@cn.fujitsu.com>
Diffstat (limited to 'tsutils/tsutils.c')
-rw-r--r--tsutils/tsutils.c37
1 files changed, 20 insertions, 17 deletions
diff --git a/tsutils/tsutils.c b/tsutils/tsutils.c
index 79385d1..125e975 100644
--- a/tsutils/tsutils.c
+++ b/tsutils/tsutils.c
@@ -19,40 +19,41 @@
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
+#include <limits.h>
#define LONG_BITS (sizeof(long) << 3)
#define NUM_LONGS(bits) (((bits) + LONG_BITS - 1) / LONG_BITS)
#define DEV_INPUT "/dev/input"
+#define LENGTH_TSDEVNODE (NAME_MAX + 1 + sizeof(DEV_INPUT))
+#define LENGTH_TSINFO (LENGTH_TSDEVNODE + 2 + 11*2)
-char tsInfo[200];
+char tsInfo[LENGTH_TSINFO];
static inline int testBit(long bit, const long *array) {
return (array[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
}
char* getTouchScreenInfo() {
- DIR* dir;
+ DIR* dir;
struct dirent* itemPtr;
int fd;
int isSingleTouch = 0, hasTouchScreen = 0;
long absbits[NUM_LONGS(ABS_CNT)];
- char tsDevNode[100];
+ char tsDevNode[LENGTH_TSDEVNODE];
struct input_absinfo absInfo;
+ int maxX, maxY;
- int maxX, maxY;
+ memset(tsDevNode, 0, sizeof(tsDevNode));
+ memset(tsInfo, 0, sizeof(tsInfo));
- memset(tsDevNode, 0, sizeof(tsDevNode));
- memset(tsInfo, 0, sizeof(tsInfo));
-
- if ((dir = opendir(DEV_INPUT)) == NULL) {
+ if ((dir = opendir(DEV_INPUT)) == NULL) {
printf("open %s failed.\n", DEV_INPUT);
return NULL;
}
- while ((itemPtr = readdir(dir)) != NULL) {
- //printf("name : %s---type : %d\n", itemPtr->d_name, itemPtr->d_type);
+ while ((itemPtr = readdir(dir)) != NULL) {
if ((strstr(itemPtr->d_name, "event") != NULL) && (2 == itemPtr->d_type)) {
- sprintf(tsDevNode, "%s/%s", DEV_INPUT, itemPtr->d_name);
+ snprintf(tsDevNode, sizeof(tsDevNode), "%s/%s", DEV_INPUT, itemPtr->d_name);
fd = open(tsDevNode, O_RDONLY);
if (fd < 0) {
printf("open %s failed.\n", tsDevNode);
@@ -81,15 +82,17 @@ char* getTouchScreenInfo() {
}
hasTouchScreen = 1;
- break;
+ break;
}
}
- if (!hasTouchScreen) return NULL;
+ if (!hasTouchScreen) {
+ return NULL;
+ }
- sprintf(tsInfo, "%s %d %d", tsDevNode, maxX, maxY);
+ snprintf(tsInfo, sizeof(tsInfo), "%s %d %d", tsDevNode, maxX, maxY);
- close(fd);
- closedir(dir);
- return tsInfo;
+ close(fd);
+ closedir(dir);
+ return tsInfo;
}