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Ensure that UTF16 strings are properly zero-terminated before returning them

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in an sqlite3_value_text16() request, even if the string is invalid UTF16
because it was formed from an arbitrary and/or odd-length BLOB.

FossilOrigin-Name: 3a16ddf91f0c9c516a7fc2a9d4a4f69a8326f9b8ea66421e9ef1a2d663687b70
This commit is contained in:
drh 2019-05-03 19:34:41 +00:00
parent a51297200f
commit 30d3b0ceb5
3 changed files with 18 additions and 12 deletions
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14
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@ -1,5 +1,5 @@
C Fix\sa\smemory-leak/segfault\scaused\sby\susing\sOP_OpenDup\sand\sOP_OpenEphemeral\son\sthe\ssame\sVM\scursor.
D 2019-05-03T18:50:24.588
C Ensure\sthat\sUTF16\sstrings\sare\sproperly\szero-terminated\sbefore\sreturning\sthem\nin\san\ssqlite3_value_text16()\srequest,\seven\sif\sthe\sstring\sis\sinvalid\sUTF16\nbecause\sit\swas\sformed\sfrom\san\sarbitrary\sand/or\sodd-length\sBLOB.
D 2019-05-03T19:34:41.227
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F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -597,7 +597,7 @@ F src/vdbeInt.h 3ba14553508d66f58753952d6dd287dce4ec735de02c6440858b4891aed51c17
F src/vdbeapi.c 5ef992332225d8b6151137fcaf33b4ba4d38db7e7c51f871d2e9ecb960f3709a
F src/vdbeaux.c f873b5c2efcf8a4d6ecfc5b1a5b06fd810419198f3bd882175d371cc03801873
F src/vdbeblob.c f5c70f973ea3a9e915d1693278a5f890dc78594300cf4d54e64f2b0917c94191
F src/vdbemem.c df36fd36c7585e42869f3a44f5da5dc70e13306bc97ba52eebe069e174ba55db
F src/vdbemem.c 42a33c8f00728fcf141b05f9c4d1bc3a2d34ebc4427b8631898e31fc22ea944d
F src/vdbesort.c 66592d478dbb46f19aed0b42222325eadb84deb40a90eebe25c6e7c1d8468f47
F src/vdbetrace.c 79d6dbbc479267b255a7de8080eee6e729928a0ef93ed9b0bfa5618875b48392
F src/vtab.c 1fa256c6ddad7a81e2a4dc080d015d4b0a7135767717d311298e47f6fca64bb3
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src/vdbemem.c
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@ -270,13 +270,19 @@ int sqlite3VdbeMemClearAndResize(Mem *pMem, int szNew){
/*
** It is already known that pMem contains an unterminated string.
** Add the zero terminator.
**
** Three bytes of zero are added. In this way, there is guaranteed
** to be a double-zero byte at an even byte boundary in order to
** terminate a UTF16 string, even if the initial size of the buffer
** is an odd number of bytes.
*/
static SQLITE_NOINLINE int vdbeMemAddTerminator(Mem *pMem){
if( sqlite3VdbeMemGrow(pMem, pMem->n+2, 1) ){
if( sqlite3VdbeMemGrow(pMem, pMem->n+3, 1) ){
return SQLITE_NOMEM_BKPT;
}
pMem->z[pMem->n] = 0;
pMem->z[pMem->n+1] = 0;
pMem->z[pMem->n+2] = 0;
pMem->flags |= MEM_Term;
return SQLITE_OK;
}
@ -350,9 +356,9 @@ int sqlite3VdbeMemNulTerminate(Mem *pMem){
}
/*
** Add MEM_Str to the set of representations for the given Mem. Numbers
** are converted using sqlite3_snprintf(). Converting a BLOB to a string
** is a no-op.
** Add MEM_Str to the set of representations for the given Mem. This
** routine is only called if pMem is a number of some kind, not a NULL
** or a BLOB.
**
** Existing representations MEM_Int and MEM_Real are invalidated if
** bForce is true but are retained if bForce is false.