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fix wrong data type conversion in zrangeResultBeginStore (#13148) 

In `beginResultEmission`, -1 means the result length is not known in
advance. But after #12185, if we pass -1 to `zrangeResultBeginStore`, it
will convert to SIZE_MAX in `zsetTypeCreate` and try to `dictExpand`.
Although `dictExpand` won't succeed because the size overflows, I think
we'd better to avoid this wrong conversion.

This bug can be triggered when the source of `zrangestore` doesn't exist
or we use `zrangestore` command with `byscore` or `bylex`.
The impact is that dst keys will be converted to use skiplist instead of
listpack.
This commit is contained in:
Yanqi Lv 2024-03-19 14:52:55 +08:00 committed by GitHub
parent e04d41d78d
commit bad33f8738
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2 changed files with 9 additions and 2 deletions
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5
src/t_zset.c
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@ -1234,7 +1234,8 @@ unsigned long zsetLength(const robj *zobj) {
* and the value len hint indicates the approximate individual size of the added elements,
* they are used to determine the initial representation.
*
* If the hints are not known, and underestimation or 0 is suitable. */
* If the hints are not known, and underestimation or 0 is suitable.
* We should never pass a negative value because it will convert to a very large unsigned number. */
robj *zsetTypeCreate(size_t size_hint, size_t val_len_hint) {
if (size_hint <= server.zset_max_listpack_entries &&
val_len_hint <= server.zset_max_listpack_value)
@ -3073,7 +3074,7 @@ static void zrangeResultFinalizeClient(zrange_result_handler *handler,
/* Result handler methods for storing the ZRANGESTORE to a zset. */
static void zrangeResultBeginStore(zrange_result_handler *handler, long length)
{
handler->dstobj = zsetTypeCreate(length, 0);
handler->dstobj = zsetTypeCreate(length >= 0 ? length : 0, 0);
}
static void zrangeResultEmitCBufferForStore(zrange_result_handler *handler,

6
tests/unit/type/zset.tcl
View File

@ -2286,12 +2286,18 @@ start_server {tags {"zset"}} {
} {b 2 c 3}
test {ZRANGESTORE BYLEX} {
set res [r zrangestore z3{t} z1{t} \[b \[c BYLEX]
assert_equal $res 2
assert_encoding listpack z3{t}
set res [r zrangestore z2{t} z1{t} \[b \[c BYLEX]
assert_equal $res 2
r zrange z2{t} 0 -1 withscores
} {b 2 c 3}
test {ZRANGESTORE BYSCORE} {
set res [r zrangestore z4{t} z1{t} 1 2 BYSCORE]
assert_equal $res 2
assert_encoding listpack z4{t}
set res [r zrangestore z2{t} z1{t} 1 2 BYSCORE]
assert_equal $res 2
r zrange z2{t} 0 -1 withscores