Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commit78f79b6

Browse files
committed
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.
1 parente50e2e0 commit78f79b6

File tree

1 file changed

+5
-4
lines changed

1 file changed

+5
-4
lines changed

‎src/backend/utils/adt/numeric.c

Lines changed: 5 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -168,9 +168,10 @@ struct NumericData
168168
* otherwise, we want the long one. Instead of testing against each value, we
169169
* can just look at the high bit, for a slight efficiency gain.
170170
*/
171+
#defineNUMERIC_HEADER_IS_SHORT(n)(((n)->choice.n_header & 0x8000) != 0)
171172
#defineNUMERIC_HEADER_SIZE(n) \
172173
(VARHDRSZ + sizeof(uint16) + \
173-
(((NUMERIC_FLAGBITS(n)& 0x8000) == 0) ? sizeof(int16) : 0))
174+
(NUMERIC_HEADER_IS_SHORT(n)? 0 : sizeof(int16)))
174175

175176
/*
176177
* Short format definitions.
@@ -196,11 +197,11 @@ struct NumericData
196197
(NUMERIC_IS_SHORT(n) ? \
197198
(((n)->choice.n_short.n_header & NUMERIC_SHORT_SIGN_MASK) ? \
198199
NUMERIC_NEG : NUMERIC_POS) : NUMERIC_FLAGBITS(n))
199-
#defineNUMERIC_DSCALE(n)(NUMERIC_IS_SHORT((n)) ? \
200+
#defineNUMERIC_DSCALE(n)(NUMERIC_HEADER_IS_SHORT((n)) ? \
200201
((n)->choice.n_short.n_header & NUMERIC_SHORT_DSCALE_MASK) \
201202
>> NUMERIC_SHORT_DSCALE_SHIFT \
202203
: ((n)->choice.n_long.n_sign_dscale & NUMERIC_DSCALE_MASK))
203-
#defineNUMERIC_WEIGHT(n)(NUMERIC_IS_SHORT((n)) ? \
204+
#defineNUMERIC_WEIGHT(n)(NUMERIC_HEADER_IS_SHORT((n)) ? \
204205
(((n)->choice.n_short.n_header & NUMERIC_SHORT_WEIGHT_SIGN_MASK ? \
205206
~NUMERIC_SHORT_WEIGHT_MASK : 0) \
206207
| ((n)->choice.n_short.n_header & NUMERIC_SHORT_WEIGHT_MASK)) \
@@ -361,7 +362,7 @@ static void dump_var(const char *str, NumericVar *var);
361362

362363
#defineinit_var(v)MemSetAligned(v, 0, sizeof(NumericVar))
363364

364-
#defineNUMERIC_DIGITS(num) (NUMERIC_IS_SHORT(num) ? \
365+
#defineNUMERIC_DIGITS(num) (NUMERIC_HEADER_IS_SHORT(num) ? \
365366
(num)->choice.n_short.n_data : (num)->choice.n_long.n_data)
366367
#defineNUMERIC_NDIGITS(num) \
367368
((VARSIZE(num) - NUMERIC_HEADER_SIZE(num)) / sizeof(NumericDigit))

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp