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Overview
| Comment: | Avoid a left-shift of a negative value (undefined behaviour) when dealing with a corrupt database in fts3. Cherrypick of [b851d12474]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | branch-3.22 |
| Files: | files | file ages | folders |
| SHA3-256: |
2fa63a8be62a06136a34d32351229b54 |
| User & Date: | dan 2018-12-26 11:39:39 |
Context
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2018-12-26
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| 14:23 | Fix a problem with corrupt fts3 database detection introduced by [27199380]. (check-in: ceeb4fba user: dan tags: branch-3.22) | |
| 11:39 | Avoid a left-shift of a negative value (undefined behaviour) when dealing with a corrupt database in fts3. Cherrypick of [b851d12474]. (check-in: 2fa63a8b user: dan tags: branch-3.22) | |
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2018-12-24
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| 13:39 | Change the way a comparison used to detect corrupt databases in fts3 is done to avoid potential pointer overflow in 32-bit builds. Cherrypick of [95a9a39ff7]. (check-in: 27199380 user: dan tags: branch-3.22) | |
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2018-12-22
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| 09:39 | Avoid a left-shift of a negative value (undefined behaviour) when dealing with a corrupt database in fts3. (check-in: b851d124 user: dan tags: trunk) | |
Changes
Changes to ext/fts3/fts3.c.
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}while( vu!=0 ); q[-1] &= 0x7f; /* turn off high bit in final byte */ assert( q - (unsigned char *)p <= FTS3_VARINT_MAX ); return (int) (q - (unsigned char *)p); } #define GETVARINT_STEP(v, ptr, shift, mask1, mask2, var, ret) \ v = (v & mask1) | ( (*ptr++) << shift ); \ if( (v & mask2)==0 ){ var = v; return ret; } #define GETVARINT_INIT(v, ptr, shift, mask1, mask2, var, ret) \ v = (*ptr++); \ if( (v & mask2)==0 ){ var = v; return ret; } /* ** Read a 64-bit variable-length integer from memory starting at p[0]. ................................................................................ } /* ** Similar to sqlite3Fts3GetVarint(), except that the output is truncated to ** a non-negative 32-bit integer before it is returned. */ int sqlite3Fts3GetVarint32(const char *p, int *pi){ u32 a; #ifndef fts3GetVarint32 GETVARINT_INIT(a, p, 0, 0x00, 0x80, *pi, 1); #else a = (*p++); assert( a & 0x80 ); #endif GETVARINT_STEP(a, p, 7, 0x7F, 0x4000, *pi, 2); GETVARINT_STEP(a, p, 14, 0x3FFF, 0x200000, *pi, 3); GETVARINT_STEP(a, p, 21, 0x1FFFFF, 0x10000000, *pi, 4); a = (a & 0x0FFFFFFF ); *pi = (int)(a | ((u32)(*p & 0x07) << 28)); assert( 0==(a & 0x80000000) ); assert( *pi>=0 ); return 5; } /* ** Return the number of bytes required to encode v as a varint |
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}while( vu!=0 ); q[-1] &= 0x7f; /* turn off high bit in final byte */ assert( q - (unsigned char *)p <= FTS3_VARINT_MAX ); return (int) (q - (unsigned char *)p); } #define GETVARINT_STEP(v, ptr, shift, mask1, mask2, var, ret) \ v = (v & mask1) | ( (*(ptr++)) << shift ); \ if( (v & mask2)==0 ){ var = v; return ret; } #define GETVARINT_INIT(v, ptr, shift, mask1, mask2, var, ret) \ v = (*ptr++); \ if( (v & mask2)==0 ){ var = v; return ret; } /* ** Read a 64-bit variable-length integer from memory starting at p[0]. ................................................................................ } /* ** Similar to sqlite3Fts3GetVarint(), except that the output is truncated to ** a non-negative 32-bit integer before it is returned. */ int sqlite3Fts3GetVarint32(const char *p, int *pi){ const unsigned char *ptr = (const unsigned char*)p; u32 a; #ifndef fts3GetVarint32 GETVARINT_INIT(a, ptr, 0, 0x00, 0x80, *pi, 1); #else a = (*ptr++); assert( a & 0x80 ); #endif GETVARINT_STEP(a, ptr, 7, 0x7F, 0x4000, *pi, 2); GETVARINT_STEP(a, ptr, 14, 0x3FFF, 0x200000, *pi, 3); GETVARINT_STEP(a, ptr, 21, 0x1FFFFF, 0x10000000, *pi, 4); a = (a & 0x0FFFFFFF ); *pi = (int)(a | ((u32)(*ptr & 0x07) << 28)); assert( 0==(a & 0x80000000) ); assert( *pi>=0 ); return 5; } /* ** Return the number of bytes required to encode v as a varint |