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Take care to avoid a buffer over-read when adding a KEYINFO structure

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to the P4 parameter of an opcode.

FossilOrigin-Name: 937b931a7cdad6874638158ed6a9ab6356b0bd0c
This commit is contained in:
drh 2010-04-02 12:55:38 +00:00
parent c2a4bab462
commit a378c566d2
3 changed files with 11 additions and 11 deletions
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18
manifest
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@ -1,8 +1,8 @@
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D 2010-04-02T12:46:46
C Take\scare\sto\savoid\sa\sbuffer\sover-read\swhen\sadding\sa\sKEYINFO\sstructure\s\nto\sthe\sP4\sparameter\sof\san\sopcode.
D 2010-04-02T12:55:39
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@ -218,7 +218,7 @@ F src/vdbe.c 760a0857cdcc000759bd3a5b8e2907dd351072bc
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F src/vdbeblob.c 5327132a42a91e8b7acfb60b9d2c3b1c5c863e0e
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2
src/vdbeaux.c
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@ -743,7 +743,7 @@ void sqlite3VdbeChangeP4(Vdbe *p, int addr, const char *zP4, int n){
pOp->p4.pKeyInfo = pKeyInfo;
if( pKeyInfo ){
u8 *aSortOrder;
memcpy((char*)pKeyInfo, zP4, nByte);
memcpy((char*)pKeyInfo, zP4, nByte - nField);
aSortOrder = pKeyInfo->aSortOrder;
if( aSortOrder ){
pKeyInfo->aSortOrder = (unsigned char*)&pKeyInfo->aColl[nField];