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Subject: [PATCH] Limit the "precision" of floating-point to text conversions
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in the printf() function to 100,000,000.
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---
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src/printf.c | 12 ++++++++++++
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test/printf.test | 16 +++++++++++++---
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2 files changed, 25 insertions(+), 3 deletions(-)
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diff --git a/src/printf.c b/src/printf.c
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index 7bce83f..260bf79 100644
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--- a/src/printf.c
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+++ b/src/printf.c
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@@ -165,6 +165,13 @@ static char *getTextArg(PrintfArguments *p){
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#endif
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#define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */
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+/*
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+** Hard limit on the precision of floating-point conversions.
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+*/
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+#ifndef SQLITE_PRINTF_PRECISION_LIMIT
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+# define SQLITE_FP_PRECISION_LIMIT 100000000
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+#endif
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+
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/*
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** Render a string given by "fmt" into the StrAccum object.
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*/
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@@ -471,6 +478,11 @@ void sqlite3_str_vappendf(
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length = 0;
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#else
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if( precision<0 ) precision = 6; /* Set default precision */
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+#ifdef SQLITE_FP_PRECISION_LIMIT
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+ if( precision>SQLITE_FP_PRECISION_LIMIT ){
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+ precision = SQLITE_FP_PRECISION_LIMIT;
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+ }
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+#endif
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if( realvalue<0.0 ){
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realvalue = -realvalue;
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prefix = '-';
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diff --git a/test/printf.test b/test/printf.test
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index d768898..a2b5e2a 100644
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--- a/test/printf.test
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+++ b/test/printf.test
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@@ -538,9 +538,11 @@ do_test printf-2.1.2.8 {
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do_test printf-2.1.2.9 {
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sqlite3_mprintf_double {abc: %d %d (%1.1g) :xyz} 1 1 1.0e-20
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} {abc: 1 1 (1e-20) :xyz}
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-do_test printf-2.1.2.10 {
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- sqlite3_mprintf_double {abc: %*.*f} 2000000000 1000000000 1.0e-20
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-} {abc: }
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+if {$SQLITE_MAX_LENGTH<=[expr 1000*1000*1000]} {
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+ do_test printf-2.1.2.10 {
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+ sqlite3_mprintf_double {abc: %*.*f} 2000000000 1000000000 1.0e-20
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+ } {}
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+}
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do_test printf-2.1.3.1 {
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sqlite3_mprintf_double {abc: (%*.*f) :xyz} 1 1 1.0
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} {abc: (1.0) :xyz}
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@@ -3777,4 +3779,12 @@ foreach ::iRepeat {0 1} {
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}
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}
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+# 2020-05-23
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+# ticket 23439ea582241138
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+#
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+do_execsql_test printf-16.1 {
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+ SELECT printf('%.*g',2147483647,0.01);
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+} {0.01}
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+
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+
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finish_test
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--
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2.24.1
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