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Fix an utterly harmless "applying zero offset to null pointer" UB warning

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in sqlite3AtoF():

FossilOrigin-Name: 052fdf5e58b41ccadaa5aac293ceb4d309ced661d46f3a52be9eb8d01d347a82
This commit is contained in:
drh 2019-12-13 23:38:57 +00:00
parent 0f1fa5de04
commit e3a4f2cf77
3 changed files with 10 additions and 8 deletions
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@ -1,5 +1,5 @@
C Patch\sto\sthe\spage\scache\sto\savoid\sharmless\spointer\sarithmetic\sthat\sdue\sto\sbugs\nin\sthe\sSTD-C\sspec\sis\stechnically\sUB.\s\sThis\sis\sto\sfix\sa\sharmless\sUBSAN\ncomplaint\sthat\sOSSFuzz\sis\shitting.
D 2019-12-13T21:24:46.081
C Fix\san\sutterly\sharmless\s"applying\szero\soffset\sto\snull\spointer"\sUB\swarning\nin\ssqlite3AtoF():
D 2019-12-13T23:38:57.778
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -597,7 +597,7 @@ F src/trigger.c 681ccdb910a87243940d63f99b26190d9c5d2534c2ded3c0825b7c0e315a342e
F src/update.c 07a50767f7d3e26d4c887c31cd66448d700d3215caea6023acf7269336097df7
F src/upsert.c b445315c8958d8f17ec3297d06842e61dacaad0633ccaec1e4e160de7e562212
F src/utf.c 2f0fac345c7660d5c5bd3df9e9d8d33d4c27f366bcfb09e07443064d751a0507
F src/util.c 66b22af7b359ce6493c34fef28c87d5c2d1765f212d6e4cd5e08d99ac30b89bb
F src/util.c 2c92bc706bbdb1c45a25180291e7e05a56e297aa5dd7b2bcd2b1c47e8bb05b17
F src/vacuum.c 82dcec9e7b1afa980288718ad11bc499651c722d7b9f32933c4d694d91cb6ebf
F src/vdbe.c 30fc70ea7f1a47f50cd6557d8073b57fcf2275b537b896ba7e8d602065bc5648
F src/vdbe.h fdbc0a11e5768a702b46ce63286f60e22e71351a29bd98b3666405e1fccc7802
@ -1852,7 +1852,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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P c29fc21288e37f81a1617c5e2961c575d3bca6a1d1b013b2e0a99774afb1dcdb
R 3d3d486575d8e4fc08b0a007870e491d
U drh
Z 4fa57844859159ee82f87f0f14b6814f
Z 3aa16a4b7876299855c152aecef9a886

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manifest.uuid
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@ -1 +1 @@
c29fc21288e37f81a1617c5e2961c575d3bca6a1d1b013b2e0a99774afb1dcdb
052fdf5e58b41ccadaa5aac293ceb4d309ced661d46f3a52be9eb8d01d347a82

4
src/util.c
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@ -389,7 +389,7 @@ static LONGDOUBLE_TYPE sqlite3Pow10(int E){
int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
#ifndef SQLITE_OMIT_FLOATING_POINT
int incr;
const char *zEnd = z + length;
const char *zEnd;
/* sign * significand * (10 ^ (esign * exponent)) */
int sign = 1; /* sign of significand */
i64 s = 0; /* significand */
@ -403,9 +403,11 @@ int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
*pResult = 0.0; /* Default return value, in case of an error */
if( length==0 ) return 0;
if( enc==SQLITE_UTF8 ){
incr = 1;
zEnd = z + length;
}else{
int i;
incr = 2;