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Overview
Comment:Prevent unsigned 32-bit integer overflow from leading to a buffer overread inside of an assert(). The problem fixed here is no reachable in production code.
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SHA3-256: 0f850a25d67a752fe1e9059c0c3f78e00c222113e556a7605fd3c50817b573cb
User & Date: drh 2019-01-12 21:30:26
Context
2019-01-13
00:58
Move a local variable declaration into the outermost scope in which it is used. This fixes an ASAN warning. check-in: ac3b6021 user: drh tags: trunk
2019-01-12
21:30
Prevent unsigned 32-bit integer overflow from leading to a buffer overread inside of an assert(). The problem fixed here is no reachable in production code. check-in: 0f850a25 user: drh tags: trunk
20:55
Fix another problem with handling corrupt records in fts5_decode(). check-in: 726e398b user: dan tags: trunk
Changes
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Changes to src/vdbeaux.c.

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    /* Verify that there is enough key space remaining to avoid
    ** a buffer overread.  The "d1+serial_type1+2" subexpression will
    ** always be greater than or equal to the amount of required key space.
    ** Use that approximation to avoid the more expensive call to
    ** sqlite3VdbeSerialTypeLen() in the common case.
    */
    if( d1+serial_type1+2>(u32)nKey1
     && d1+sqlite3VdbeSerialTypeLen(serial_type1)>(u32)nKey1 
    ){
      break;
    }

    /* Extract the values to be compared.
    */
    d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);







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    /* Verify that there is enough key space remaining to avoid
    ** a buffer overread.  The "d1+serial_type1+2" subexpression will
    ** always be greater than or equal to the amount of required key space.
    ** Use that approximation to avoid the more expensive call to
    ** sqlite3VdbeSerialTypeLen() in the common case.
    */
    if( d1+(u64)serial_type1+2>(u64)nKey1
     && d1+(u64)sqlite3VdbeSerialTypeLen(serial_type1)>(u64)nKey1 
    ){
      break;
    }

    /* Extract the values to be compared.
    */
    d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);