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Don't seek of out-of-bound value even if the result is not used 

Fixes this -fno-sanitize-recover=undefined fail,

/set/iter: hb-algs.hh:1016:60: runtime error: index 4294967295 out of bounds for type 'unsigned long long const[8]'
    #0 0x4d1e09 in hb_vector_size_t<unsigned long long, 64u>::operator[](unsigned int) const /home/user/code/harfbuzz/src/./hb-algs.hh:1016:60
    #1 0x4d8b5f in hb_set_t::page_t::previous(unsigned int*) const /home/user/code/harfbuzz/src/./hb-set.hh:139:53
    #2 0x4d0ada in hb_set_t::previous(unsigned int*) const /home/user/code/harfbuzz/src/./hb-set.hh:602:36
    #3 0x4cd76f in hb_set_previous /home/user/code/harfbuzz/src/hb-set.cc:494:15
    #4 0x4ca8af in test_set_iter /home/user/code/harfbuzz/test/api/test-set.c:310:3
    #5 0x7f3a4f3e0f49  (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x72f49)
    #6 0x7f3a4f3e0e7a  (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x72e7a)
    #7 0x7f3a4f3e1121 in g_test_run_suite (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x73121)
    #8 0x7f3a4f3e1140 in g_test_run (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x73140)
    #9 0x4c8894 in hb_test_run /home/user/code/harfbuzz/test/api/./hb-test.h:88:10
    #10 0x4c8894 in main /home/user/code/harfbuzz/test/api/test-set.c:408:10
    #11 0x7f3a4e3d2b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #12 0x41e7d9 in _start (/home/user/code/harfbuzz/test/api/test-set+0x41e7d9)
This commit is contained in:
Ebrahim Byagowi 2019-09-18 00:50:32 +04:30
parent d8af9ee017
commit b73313ade7
1 changed files with 6 additions and 1 deletions
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7
src/hb-set.hh
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@ -136,12 +136,17 @@ struct hb_set_t
unsigned int j = m & ELT_MASK;
const elt_t vv = v[i] & ((elt_t (1) << (j + 1)) - 1);
for (const elt_t *p = &vv; (int) i >= 0; p = &v[--i])
const elt_t *p = &vv;
while (true)
{
if (*p)
{
*codepoint = i * ELT_BITS + elt_get_max (*p);
return true;
}
if ((int) i <= 0) break;
p = &v[--i];
}
*codepoint = INVALID;
return false;