commit d9e2db1efd531b5fb0d47a9c03d19f871145a76d Author: Nick Mathewson nickm@torproject.org Date: Tue Sep 12 15:57:25 2017 -0400
Avoid sscanf() warnings from openbsd in the unit tests
OpenBSD doesn't like tricks where you use a too-wide sscanf argument for a too-narrow array, even when you know the input string statically. The fix here is just to use bigger buffers.
Fixes 15582; bugfix on a3dafd3f58bb312 in 0.2.6.2-alpha. --- changes/bug15582 | 4 ++++ src/test/test_util.c | 21 ++++++++++++++++----- 2 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/changes/bug15582 b/changes/bug15582 new file mode 100644 index 000000000..5ea6431cf --- /dev/null +++ b/changes/bug15582 @@ -0,0 +1,4 @@ + o Minor bugfixes (compilation): + - Avoid compiler warnings in the unit tests for running tor_sscanf() + with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha. + diff --git a/src/test/test_util.c b/src/test/test_util.c index fcda56456..0b707caee 100644 --- a/src/test/test_util.c +++ b/src/test/test_util.c @@ -2500,7 +2500,7 @@ test_util_sscanf(void *arg) { unsigned u1, u2, u3; unsigned long ulng; - char s1[20], s2[10], s3[10], ch; + char s1[20], s2[10], s3[10], ch, *huge = NULL; int r; long lng1,lng2; int int1, int2; @@ -2512,7 +2512,13 @@ test_util_sscanf(void *arg) tt_int_op(-1,OP_EQ, tor_sscanf("wrong", "%5c", s1)); /* %c cannot have a number. */ tt_int_op(-1,OP_EQ, tor_sscanf("hello", "%s", s1)); /* %s needs a number. */ - tt_int_op(-1,OP_EQ, tor_sscanf("prettylongstring", "%999999s", s1)); + /* this will fail because we don't allow widths longer than 9999 */ + { + huge = tor_malloc(1000000); + r = tor_sscanf("prettylongstring", "%99999s", huge); + tor_free(huge); + tt_int_op(-1,OP_EQ, r); + } #if 0 /* GCC thinks these two are illegal. */ test_eq(-1, tor_sscanf("prettylongstring", "%0s", s1)); @@ -2618,8 +2624,13 @@ test_util_sscanf(void *arg) tt_int_op(2,OP_EQ, tor_sscanf("76trombones", "%6u%9s", &u1, s1)); /* %u%s */ tt_int_op(76,OP_EQ, u1); tt_str_op(s1,OP_EQ, "trombones"); - tt_int_op(1,OP_EQ, tor_sscanf("prettylongstring", "%999s", s1)); - tt_str_op(s1,OP_EQ, "prettylongstring"); + { + huge = tor_malloc(1000); + r = tor_sscanf("prettylongstring", "%999s", huge); + tt_int_op(1,OP_EQ, r); + tt_str_op(huge,OP_EQ, "prettylongstring"); + tor_free(huge); + } /* %s doesn't eat spaces */ tt_int_op(2,OP_EQ, tor_sscanf("hello world", "%9s %9s", s1, s2)); tt_str_op(s1,OP_EQ, "hello"); @@ -2843,7 +2854,7 @@ test_util_sscanf(void *arg) test_feq(d4, 3.2);
done: - ; + tor_free(huge); }
#define tt_char_op(a,op,b) tt_assert_op_type(a,op,b,char,"%c")