If read() fails and returns -1 buf would be accessed out of bounds.
Signed-off-by: Thomas Weißschuh linux@weissschuh.net --- tools/testing/selftests/nolibc/nolibc-test.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 82714051c72f..a334f8450a34 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1031,6 +1031,12 @@ 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); + if (r == -1) { + llen += printf(" read() = %s", errorname(errno)); + result(llen, FAIL); + return 1; + } + buf[r] = '\0';
fclose(memfile);