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Fix BITFIELD i64 type handling, see #7417.

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antirez 2020-06-22 11:41:19 +02:00
parent 59fd178014
commit 746297314f
1 changed files with 8 additions and 6 deletions
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14
src/bitops.c
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@ -257,7 +257,7 @@ int64_t getSignedBitfield(unsigned char *p, uint64_t offset, uint64_t bits) {
/* If the top significant bit is 1, propagate it to all the
* higher bits for two's complement representation of signed
* integers. */
if (value & ((uint64_t)1 << (bits-1)))
if (bits < 64 && (value & ((uint64_t)1 << (bits-1))))
value |= ((uint64_t)-1) << bits;
return value;
}
@ -356,7 +356,6 @@ int checkSignedBitfieldOverflow(int64_t value, int64_t incr, uint64_t bits, int
handle_wrap:
{
uint64_t mask = ((uint64_t)-1) << bits;
uint64_t msb = (uint64_t)1 << (bits-1);
uint64_t a = value, b = incr, c;
c = a+b; /* Perform addition as unsigned so that's defined. */
@ -364,10 +363,13 @@ handle_wrap:
/* If the sign bit is set, propagate to all the higher order
* bits, to cap the negative value. If it's clear, mask to
* the positive integer limit. */
if (c & msb) {
c |= mask;
} else {
c &= ~mask;
if (bits < 64) {
uint64_t mask = ((uint64_t)-1) << bits;
if (c & msb) {
c |= mask;
} else {
c &= ~mask;
}
}
*limit = c;
}