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Earlier detection of a database corruption case in balance_nonroot(), to

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prevent a possible use of an uninitialized variable.

FossilOrigin-Name: c509d8a8aebe0da4847e95cf737c21313a665de9a540da2db57b8ed22f98a402
This commit is contained in:
drh 2019-05-02 15:56:39 +00:00
parent cf1747b782
commit e12ca5abf6
3 changed files with 13 additions and 7 deletions
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12
manifest
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@ -1,5 +1,5 @@
C The\scollating\ssequence\sof\sthe\scolumn\smust\sbe\sTEXT\sif\sthe\sLIKE\sor\sGLOB\spattern\nstarts\swith\sa\s"+"\ssign.\s\sThis\sis\sanother\scase\sof\sticket\n[c94369cae9b561b1f996d005]\sthat\swas\sdiscovered\sby\sManuel\sRigger.
D 2019-05-02T01:41:53.006
C Earlier\sdetection\sof\sa\sdatabase\scorruption\scase\sin\sbalance_nonroot(),\sto\nprevent\sa\spossible\suse\sof\san\suninitialized\svariable.
D 2019-05-02T15:56:39.144
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -460,7 +460,7 @@ F src/auth.c 0fac71038875693a937e506bceb492c5f136dd7b1249fbd4ae70b4e8da14f9df
F src/backup.c 78d3cecfbe28230a3a9a1793e2ead609f469be43e8f486ca996006be551857ab
F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
F src/btree.c ffe7101006aee2ab9e9dec2fc001998e57a8e59419c6ea4072d6c3935d3d50fb
F src/btree.c e048f240d9562ef0c6b87e9d8dfa31a08c262d6c8d52c1ac0d6ca340ed8188e0
F src/btree.h c11446f07ec0e9dc85af8041cb0855c52f5359c8b2a43e47e02a685282504d89
F src/btreeInt.h 6111c15868b90669f79081039d19e7ea8674013f907710baa3c814dc3f8bfd3f
F src/build.c 2d9ddfeaf8e1dafc7e1fcc8a84e7a8b455199dac3b69037fc73af6279aa8447b
@ -1822,7 +1822,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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P b043a54c3de54b286c4eae564eab6b99118a410d99bdb63480faba3123d2ca11
R 18ab7c62d0e00aa10b61e04e6385c846
U drh
Z a4cc8a25e8e445f4572d088b41336647
Z 008cd703689ead8de489aed4e8570f99

2
manifest.uuid
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@ -1 +1 @@
b043a54c3de54b286c4eae564eab6b99118a410d99bdb63480faba3123d2ca11
c509d8a8aebe0da4847e95cf737c21313a665de9a540da2db57b8ed22f98a402

6
src/btree.c
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@ -7636,6 +7636,7 @@ static int balance_nonroot(
u16 maskPage = pOld->maskPage;
u8 *piCell = aData + pOld->cellOffset;
u8 *piEnd;
VVA_ONLY( int nCellAtStart = b.nCell; )
/* Verify that all sibling pages are of the same "type" (table-leaf,
** table-interior, index-leaf, or index-interior).
@ -7664,6 +7665,10 @@ static int balance_nonroot(
*/
memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
if( pOld->nOverflow>0 ){
if( limit<pOld->aiOvfl[0] ){
rc = SQLITE_CORRUPT_BKPT;
goto balance_cleanup;
}
limit = pOld->aiOvfl[0];
for(j=0; j<limit; j++){
b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
@ -7683,6 +7688,7 @@ static int balance_nonroot(
piCell += 2;
b.nCell++;
}
assert( (b.nCell-nCellAtStart)==(pOld->nCell+pOld->nOverflow) );
cntOld[i] = b.nCell;
if( i<nOld-1 && !leafData){