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Commiteaf99e4

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committed
Ensure Soundex difference() function handles empty input sanely.
fuzzystrmatch's difference() function assumes that _soundex()always initializes its output buffer fully. This was not so forthe case of a string containing no alphabetic characters, resultingin unstable output and Valgrind complaints.Fix by using memset() to fill the whole buffer in the early-exitcase. Also make some cosmetic improvements (I didn't care for therandom switches between "instr[0]" and "*instr" notation).Report and diagnosis by Alexander Lakhin (bug #17935).Back-patch to all supported branches.Discussion:https://postgr.es/m/17935-b99316aa79c18513@postgresql.org
1 parentf06156d commiteaf99e4

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3 files changed

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3 files changed

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‎contrib/fuzzystrmatch/expected/fuzzystrmatch.out

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -23,6 +23,12 @@ SELECT soundex('Anne'), soundex('Margaret'), difference('Anne', 'Margaret');
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A500 | M626 | 0
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(1 row)
2525

26+
SELECT soundex(''), difference('', '');
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soundex | difference
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---------+------------
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| 4
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(1 row)
31+
2632
SELECT levenshtein('GUMBO', 'GAMBOL');
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levenshtein
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-------------

‎contrib/fuzzystrmatch/fuzzystrmatch.c

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -727,16 +727,14 @@ _soundex(const char *instr, char *outstr)
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AssertArg(instr);
728728
AssertArg(outstr);
729729

730-
outstr[SOUNDEX_LEN]='\0';
731-
732730
/* Skip leading non-alphabetic characters */
733-
while (!isalpha((unsignedchar)instr[0])&&instr[0])
731+
while (*instr&&!isalpha((unsignedchar)*instr))
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++instr;
735733

736-
/*Nostring left */
737-
if (!instr[0])
734+
/*If nostring left, return all-zeroes buffer */
735+
if (!*instr)
738736
{
739-
outstr[0]= (char)0;
737+
memset(outstr,'\0',SOUNDEX_LEN+1);
740738
return;
741739
}
742740

@@ -749,7 +747,7 @@ _soundex(const char *instr, char *outstr)
749747
if (isalpha((unsignedchar)*instr)&&
750748
soundex_code(*instr)!=soundex_code(*(instr-1)))
751749
{
752-
*outstr=soundex_code(instr[0]);
750+
*outstr=soundex_code(*instr);
753751
if (*outstr!='0')
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{
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++outstr;
@@ -766,6 +764,9 @@ _soundex(const char *instr, char *outstr)
766764
++outstr;
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++count;
768766
}
767+
768+
/* And null-terminate */
769+
*outstr='\0';
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}
770771

771772
PG_FUNCTION_INFO_V1(difference);

‎contrib/fuzzystrmatch/sql/fuzzystrmatch.sql

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -6,6 +6,7 @@ SELECT soundex('hello world!');
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SELECT soundex('Anne'), soundex('Ann'), difference('Anne','Ann');
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SELECT soundex('Anne'), soundex('Andrew'), difference('Anne','Andrew');
88
SELECT soundex('Anne'), soundex('Margaret'), difference('Anne','Margaret');
9+
SELECT soundex(''), difference('','');
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SELECT levenshtein('GUMBO','GAMBOL');

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