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fix msan warnings

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This commit is contained in:
Yann Collet 2024-02-05 01:21:06 -08:00
parent 641749fc09
commit 6c35fb2e8c
2 changed files with 13 additions and 6 deletions
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5
Makefile
View File

@ -328,8 +328,9 @@ asan-%: clean
msan: clean
$(MAKE) test CC=clang MOREFLAGS="-g -fsanitize=memory -fno-omit-frame-pointer -Werror $(MOREFLAGS)" HAVE_LZMA=0 # datagen.c fails this test for no obvious reason
msan-%: clean
LDFLAGS=-fuse-ld=gold MOREFLAGS="-g -fno-sanitize-recover=all -fsanitize=memory -fno-omit-frame-pointer -Werror $(MOREFLAGS)" FUZZER_FLAGS="--no-big-tests $(FUZZER_FLAGS)" $(MAKE) -C $(TESTDIR) HAVE_LZMA=0 $*
msan-%:
$(MAKE) clean
LDFLAGS=-fuse-ld=gold MOREFLAGS="-g -fno-sanitize-recover=all -fsanitize=memory -fno-omit-frame-pointer -Werror $(MOREFLAGS)" FUZZER_FLAGS="--no-big-tests $(FUZZER_FLAGS)" $(MAKE) -j -C $(TESTDIR) HAVE_LZMA=0 $*
asan32: clean
$(MAKE) -C $(TESTDIR) test32 CC=clang MOREFLAGS="-g -fsanitize=address $(MOREFLAGS)"

14
lib/compress/zstd_opt.c
View File

@ -1164,7 +1164,8 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms,
U32 matchNb;
for (pos = 1; pos < minMatch; pos++) {
opt[pos].price = ZSTD_MAX_PRICE;
/* will be updated later on at match check */
opt[pos].mlen = 0;
opt[pos].litlen = litlen + pos;
}
for (matchNb = 0; matchNb < nbMatches; matchNb++) {
U32 const offBase = matches[matchNb].off;
@ -1205,8 +1206,8 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms,
opt[cur] = opt[cur-1];
opt[cur].litlen = litlen;
opt[cur].price = price;
if ( (optLevel == 2) /* additional check only for high modes */
&& (prevMatch.litlen == 0) /* interrupt a match */
if ( (optLevel >= 1) /* additional check only for higher modes */
&& (prevMatch.litlen == 0) /* replace a match */
&& (LL_INCPRICE(1) < 0) /* ll1 is cheaper than ll0 */
) {
/* check next position, in case it would be cheaper */
@ -1305,7 +1306,12 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms,
if ((pos > last_pos) || (price < opt[pos].price)) {
DEBUGLOG(7, "rPos:%u (ml=%2u) => new better price (%.2f<%.2f)",
pos, mlen, ZSTD_fCost(price), ZSTD_fCost(opt[pos].price));
while (last_pos < pos) { opt[last_pos+1].price = ZSTD_MAX_PRICE; last_pos++; } /* fill empty positions */
while (last_pos < pos) {
/* fill empty positions, for future comparisons */
last_pos++;
opt[last_pos].price = ZSTD_MAX_PRICE;
opt[last_pos].litlen = !0; /* just needs to be != 0, to mean "not an end of match" */
}
opt[pos].mlen = mlen;
opt[pos].off = offset;
opt[pos].litlen = 0;