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Fix a case where a malloc() error could lead to mismatched virtual-table xBegin/xCommit/xRollback callbacks.

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FossilOrigin-Name: d807304a695fc85402b86e1cd32a6e3bbb2823c8
This commit is contained in:
dan 2011-05-25 18:46:22 +00:00
parent addd8f8729
commit 2cac2078f6
3 changed files with 30 additions and 16 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\scompiler\swarning.
D 2011-05-25T15:54:09.204
C Fix\sa\scase\swhere\sa\smalloc()\serror\scould\slead\sto\smismatched\svirtual-table\sxBegin/xCommit/xRollback\scallbacks.
D 2011-05-25T18:46:22.024
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in 11dcc00a8d0e5202def00e81732784fb0cc4fe1d
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -244,7 +244,7 @@ F src/vdbeaux.c 07a5226ae6e9c6e54b5fcd3c395b86e7ffdba3a4
F src/vdbeblob.c c3ccb7c8732858c680f442932e66ad06bb036562
F src/vdbemem.c 0498796b6ffbe45e32960d6a1f5adfb6e419883b
F src/vdbetrace.c 5d0dc3d5fd54878cc8d6d28eb41deb8d5885b114
F src/vtab.c 6bff354033de8eff72f42565411a72a84fd2b26b
F src/vtab.c 9ba8c7fdb7d39260c033a402f6032d3e7bc5d336
F src/wal.c de27c34c8016c00be348fc6bed588816557ceb66
F src/wal.h 66b40bd91bc29a5be1c88ddd1f5ade8f3f48728a
F src/walker.c 3112bb3afe1d85dc52317cb1d752055e9a781f8f
@ -938,7 +938,7 @@ F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
F tool/split-sqlite3c.tcl d9be87f1c340285a3e081eb19b4a247981ed290c
F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
P 92f26a8b8f18832cb1f8ba7dd8e5b020e71a5883
R 1179d31eff61655636edf672584723cf
U drh
Z c44adff51be44d9f0cc2862535697c61
P 6df99e52dabf2a243ad635529649b86c21735e91
R 02c26b8fd230a540c57276590c974e79
U dan
Z e2a23225f8e5abceac6a8fe1d14982ec

2
manifest.uuid
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@ -1 +1 @@
6df99e52dabf2a243ad635529649b86c21735e91
d807304a695fc85402b86e1cd32a6e3bbb2823c8

30
src/vtab.c
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@ -577,11 +577,11 @@ int sqlite3VtabCallConnect(Parse *pParse, Table *pTab){
return rc;
}
/*
** Add the virtual table pVTab to the array sqlite3.aVTrans[].
** Grow the db->aVTrans[] array so that there is room for at least one
** more v-table. Return SQLITE_NOMEM if a malloc fails, or SQLITE_OK otherwise.
*/
static int addToVTrans(sqlite3 *db, VTable *pVTab){
static int growVTrans(sqlite3 *db){
const int ARRAY_INCR = 5;
/* Grow the sqlite3.aVTrans array if required */
@ -596,10 +596,17 @@ static int addToVTrans(sqlite3 *db, VTable *pVTab){
db->aVTrans = aVTrans;
}
return SQLITE_OK;
}
/*
** Add the virtual table pVTab to the array sqlite3.aVTrans[]. Space should
** have already been reserved using growVTrans().
*/
static void addToVTrans(sqlite3 *db, VTable *pVTab){
/* Add pVtab to the end of sqlite3.aVTrans */
db->aVTrans[db->nVTrans++] = pVTab;
sqlite3VtabLock(pVTab);
return SQLITE_OK;
}
/*
@ -637,7 +644,10 @@ int sqlite3VtabCallCreate(sqlite3 *db, int iDb, const char *zTab, char **pzErr){
/* Justification of ALWAYS(): The xConstructor method is required to
** create a valid sqlite3_vtab if it returns SQLITE_OK. */
if( rc==SQLITE_OK && ALWAYS(sqlite3GetVTable(db, pTab)) ){
rc = addToVTrans(db, sqlite3GetVTable(db, pTab));
rc = growVTrans(db);
if( rc==SQLITE_OK ){
addToVTrans(db, sqlite3GetVTable(db, pTab));
}
}
return rc;
@ -843,10 +853,14 @@ int sqlite3VtabBegin(sqlite3 *db, VTable *pVTab){
}
}
/* Invoke the xBegin method */
rc = pModule->xBegin(pVTab->pVtab);
/* Invoke the xBegin method. If successful, add the vtab to the
** sqlite3.aVTrans[] array. */
rc = growVTrans(db);
if( rc==SQLITE_OK ){
rc = addToVTrans(db, pVTab);
rc = pModule->xBegin(pVTab->pVtab);
if( rc==SQLITE_OK ){
addToVTrans(db, pVTab);
}
}
}
return rc;