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Commit8eb1e9d

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Fix NUMERIC field access macros to treat NaNs consistently.
Commit1453435 arranged to store numericNaN values as short-header numerics, but the field access macros did notget the memo: they thought only "SHORT" numerics have short headers.Most of the time this makes no difference because we don't access theweight or dscale of a NaN; but numeric_send does that. As pointed outby Andrew Gierth, this led to fetching uninitialized bytes.AFAICS this could not have any worse consequences than that; in particular,an unaligned stored numeric would have been detoasted by PG_GETARG_NUMERIC,so that there's no risk of a fetch off the end of memory. Still, the codeis wrong on its own terms, and it's not hard to foresee future changes thatmight expose us to real risks. So back-patch to all affected branches.
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‎src/backend/utils/adt/numeric.c

Lines changed: 5 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -167,9 +167,10 @@ struct NumericData
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* otherwise, we want the long one. Instead of testing against each value, we
168168
* can just look at the high bit, for a slight efficiency gain.
169169
*/
170+
#defineNUMERIC_HEADER_IS_SHORT(n)(((n)->choice.n_header & 0x8000) != 0)
170171
#defineNUMERIC_HEADER_SIZE(n) \
171172
(VARHDRSZ + sizeof(uint16) + \
172-
(((NUMERIC_FLAGBITS(n)& 0x8000) == 0) ? sizeof(int16) : 0))
173+
(NUMERIC_HEADER_IS_SHORT(n)? 0 : sizeof(int16)))
173174

174175
/*
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* Short format definitions.
@@ -195,11 +196,11 @@ struct NumericData
195196
(NUMERIC_IS_SHORT(n) ? \
196197
(((n)->choice.n_short.n_header & NUMERIC_SHORT_SIGN_MASK) ? \
197198
NUMERIC_NEG : NUMERIC_POS) : NUMERIC_FLAGBITS(n))
198-
#defineNUMERIC_DSCALE(n)(NUMERIC_IS_SHORT((n)) ? \
199+
#defineNUMERIC_DSCALE(n)(NUMERIC_HEADER_IS_SHORT((n)) ? \
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((n)->choice.n_short.n_header & NUMERIC_SHORT_DSCALE_MASK) \
200201
>> NUMERIC_SHORT_DSCALE_SHIFT \
201202
: ((n)->choice.n_long.n_sign_dscale & NUMERIC_DSCALE_MASK))
202-
#defineNUMERIC_WEIGHT(n)(NUMERIC_IS_SHORT((n)) ? \
203+
#defineNUMERIC_WEIGHT(n)(NUMERIC_HEADER_IS_SHORT((n)) ? \
203204
(((n)->choice.n_short.n_header & NUMERIC_SHORT_WEIGHT_SIGN_MASK ? \
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~NUMERIC_SHORT_WEIGHT_MASK : 0) \
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| ((n)->choice.n_short.n_header & NUMERIC_SHORT_WEIGHT_MASK)) \
@@ -350,7 +351,7 @@ static void dump_var(const char *str, NumericVar *var);
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351352
#defineinit_var(v)MemSetAligned(v, 0, sizeof(NumericVar))
352353

353-
#defineNUMERIC_DIGITS(num) (NUMERIC_IS_SHORT(num) ? \
354+
#defineNUMERIC_DIGITS(num) (NUMERIC_HEADER_IS_SHORT(num) ? \
354355
(num)->choice.n_short.n_data : (num)->choice.n_long.n_data)
355356
#defineNUMERIC_NDIGITS(num) \
356357
((VARSIZE(num) - NUMERIC_HEADER_SIZE(num)) / sizeof(NumericDigit))

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