If read() fails and returns -1 (or returns garbage for some other reason) buf would be accessed out of bounds. Only use the return value of read() after it has been validated.
Signed-off-by: Thomas Weißschuh linux@weissschuh.net --- tools/testing/selftests/nolibc/nolibc-test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 63f09800057d..0145a44af990 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1055,7 +1055,6 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm lseek(fd, 0, SEEK_SET);
r = read(fd, buf, sizeof(buf) - 1); - buf[r] = '\0';
fclose(memfile);
@@ -1065,6 +1064,7 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm return 1; }
+ buf[r] = '\0'; llen += printf(" "%s" = "%s"", expected, buf); ret = strncmp(expected, buf, c);