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All bytes of a page are initialized, even bytes that follow a 2-byte cell

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on a malformed page.

FossilOrigin-Name: 7373a004ed0e2781cda503c73e9a94f24350ef79
This commit is contained in:
drh 2015-05-27 18:13:35 +00:00
parent f9705d4b66
commit b52e9c89df
3 changed files with 9 additions and 10 deletions
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13
manifest
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@ -1,5 +1,5 @@
C A\sdifferent\sapproach\sto\spreventing\sbuffer\soverreads\swhen\scomparing\sa\svector\nof\svalues\swith\sa\scorrupt\sindex\srecord\sthat\sspans\sat\sleast\sone\soverflow\spage.
D 2015-05-27T15:42:53.434
C All\sbytes\sof\sa\spage\sare\sinitialized,\seven\sbytes\sthat\sfollow\sa\s2-byte\scell\non\sa\smalformed\spage.
D 2015-05-27T18:13:35.676
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in afc69c576d95c25380e973496434be5f85204fa7
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -192,7 +192,7 @@ F src/auth.c b56c78ebe40a2110fd361379f7e8162d23f92240
F src/backup.c ff743689c4d6c5cb55ad42ed9d174b2b3e71f1e3
F src/bitvec.c 5eb7958c3bf65210211cbcfc44eff86d0ded7c9d
F src/btmutex.c 45a968cc85afed9b5e6cf55bf1f42f8d18107f79
F src/btree.c de509eeae5e8dbf365dbc37d1cf14dc6c12937c8
F src/btree.c 84b1f0f4688c8da2c426a158502a77617ce5f286
F src/btree.h 969adc948e89e449220ff0ff724c94bb2a52e9f1
F src/btreeInt.h 973a22a6fd61350b454ad614832b1f0a5e25a1e4
F src/build.c 85a169a0a22f8b80caf513eaf2944d39b979f571
@ -1279,8 +1279,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
P 19e2cebc12aaa4e72d3bad74af73575a0457e5d4 7e9e1b6123bc455dd7d1c894b6154ccd27acec18
R d744c38ef8fa2ca29d4e58d42264be16
T +closed 7e9e1b6123bc455dd7d1c894b6154ccd27acec18
P 95eaa49f4ee071c7a0f690a695f1f2d1ebca68a8
R bb66ca065683b551ad898269100a4272
U drh
Z 5a3a1f535bbc53578663f80d8c6e8f69
Z 3323dea07601fb482f9ef3d7ec44a46d

2
manifest.uuid
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@ -1 +1 @@
95eaa49f4ee071c7a0f690a695f1f2d1ebca68a8
7373a004ed0e2781cda503c73e9a94f24350ef79

4
src/btree.c
View File

@ -6897,13 +6897,13 @@ static int balance_nonroot(
memcpy(apCell[nCell], &pOld->aData[8], 4);
}else{
assert( leafCorrection==4 );
if( szCell[nCell]<4 ){
while( szCell[nCell]<4 ){
/* Do not allow any cells smaller than 4 bytes. If a smaller cell
** does exist, pad it with 0x00 bytes. */
assert( szCell[nCell]==3 || CORRUPT_DB );
assert( apCell[nCell]==&aSpace1[iSpace1-3] || CORRUPT_DB );
aSpace1[iSpace1++] = 0x00;
szCell[nCell] = 4;
szCell[nCell]++;
}
}
nCell++;