Improved defenses against mischief.

FossilOrigin-Name: 8bdc0d485e3ad0c7a1e818da66f106951d496b05cbe61d12c2c448f2f24b6d5d

ext/misc/sqlar.c

@@ -84,7 +84,7 @@ static void sqlarUncompressFunc(
   sqlite3_int64 sz;
 
   assert( argc==2 );
-  sz = sqlite3_value_int(argv[1]);
+  sz = sqlite3_value_int64(argv[1]);
 
   if( sz<=0 || sz==(nData = sqlite3_value_bytes(argv[0])) ){
     sqlite3_result_value(context, argv[0]);

manifest

@@ -1,5 +1,5 @@
-C Fix\sharmless\scompiler\swarnings.
-D 2026-03-10T22:43:39.845
+C Improved\sdefenses\sagainst\smischief.
+D 2026-03-11T14:43:29.846
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -397,7 +397,7 @@ F ext/misc/sha1.c 8bf60344c11a525384c2efd1ae77f160b06be336db679effaadf292d4b4145
 F ext/misc/shathree.c fd22d70620f86a0467acfdd3acd8435d5cb54eb1e2d9ff36ae44e389826993df
 F ext/misc/showauth.c 732578f0fe4ce42d577e1c86dc89dd14a006ab52
 F ext/misc/spellfix.c 693c8fd3293087fa821322967a97e59dfa24051e5d2ca7fa85790a4034db6fa4
-F ext/misc/sqlar.c a6175790482328171da47095f87608b48a476d4fac78d8a9ff18b03a2454f634
+F ext/misc/sqlar.c d7774383d07c93ab2a617cad5a25db8c4ac5150e3d9ff249f23ba248fc158974
 F ext/misc/sqlite3_stdio.c e49c07050bf7bdc87866da7583beda236f2f8c462018a34b61785d99cbddedfd
 F ext/misc/sqlite3_stdio.h 27a4ecea47e61bc9574ccdf2806f468afe23af2f95028c9b689bfa08ab1ce99f
 F ext/misc/stmt.c b090086cd6bd6281c21271d38d576eeffe662f0e6b67536352ce32bbaa438321
@@ -672,7 +672,7 @@ F src/auth.c ebec42df26b34a62b6750d30d9c2c03554a1c522020182476f7729a439fef04f
 F src/backup.c 5c97e8023aab1ce14a42387eb3ae00ba5a0644569e3476f38661fa6f824c3523
 F src/bitvec.c e242d4496774dfc88fa278177dd23b607dce369ccafb3f61b41638eea2c9b399
 F src/btmutex.c 30dada73a819a1ef5b7583786370dce1842e12e1ad941e4d05ac29695528daea
-F src/btree.c b744bf69d520534751c742cababe7ad28c3892f1e3a75242e75a20bca15a834a
+F src/btree.c fb350c445316c1cc0529703c0b76450770a1de0ab0440641a56b19f05d6fefbe
 F src/btree.h e823c46d87f63d904d735a24b76146d19f51f04445ea561f71cc3382fd1307f0
 F src/btreeInt.h 9c0f9ea5c9b5f4dcaea18111d43efe95f2ac276cd86d770dce10fd99ccc93886
 F src/build.c b993e4adef4c4cdfd7abf62e2676c467bb1923f25f40c3c7ab2a7bfbace3de7f
@@ -693,7 +693,7 @@ F src/hash.h 46b92795a95bfefb210f52f0c316e9d7cdbcdd7e7fcfb0d8be796d3a5767cddf
 F src/hwtime.h 21c2cf1f736e7b97502c3674d0c386db3f06870d6f10d0cf8174e2a4b8cb726e
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c dfd311b0ac2d4f6359e62013db67799757f4d2cc56cca5c10f4888acfbbfa3fd
-F src/json.c 8b6341a419150b28530cc21e3951b2238c35cdc312f11b2ca29017fe4b1dedc0
+F src/json.c 06cc944d51ecbdde04f465ea220034cab76dcce4e20b95d2201f6f3e2c89a854
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 56a542244fbefc739a2ef57fac007c16b2aefdb4377f584e9547db2ce3e071f9
 F src/main.c 31a13302193fbd51279c7e69cdfa0320d0de7629f9151e0964c1d320e8bdd7a4
@@ -2192,8 +2192,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh d924598cf2f55a4ecbc2aeb055c10bd5f48114793e7ba25f9585435da29e7e98
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P ff084ae341eab5c4ce9403defee03adc448c05f77648a954f0942a38f640080b
-R 8bce27aff072adbe9d6092147cf81eb2
+P d7b4a4a3d3d6296a012cc14fc2d95fe810b5bdb625209a2d28bf2c7a026749bf
+R 8ea9bae9922a2abd16a2c13b79a5bb21
 U drh
-Z f6e9bfc400ffc03bb3970566428e56a2
+Z d9fa776a4032f958fb973d5be66dbc82
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-d7b4a4a3d3d6296a012cc14fc2d95fe810b5bdb625209a2d28bf2c7a026749bf
+8bdc0d485e3ad0c7a1e818da66f106951d496b05cbe61d12c2c448f2f24b6d5d

src/btree.c

@@ -1262,7 +1262,7 @@ static void btreeParseCellPtr(
   CellInfo *pInfo         /* Fill in this structure */
 ){
   u8 *pIter;              /* For scanning through pCell */
-  u32 nPayload;           /* Number of bytes of cell payload */
+  u64 nPayload;           /* Number of bytes of cell payload */
   u64 iKey;               /* Extracted Key value */
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
@@ -1284,6 +1284,7 @@ static void btreeParseCellPtr(
     do{
       nPayload = (nPayload<<7) | (*++pIter & 0x7f);
     }while( (*pIter)>=0x80 && pIter<pEnd );
+    nPayload &= 0xffffffff;
   }
   pIter++;
 
@@ -1327,11 +1328,10 @@ static void btreeParseCellPtr(
   pIter++;
 
   pInfo->nKey = *(i64*)&iKey;
-  pInfo->nPayload = nPayload;
+  pInfo->nPayload = (u32)nPayload;
   pInfo->pPayload = pIter;
   testcase( nPayload==pPage->maxLocal );
   testcase( nPayload==(u32)pPage->maxLocal+1 );
-  assert( nPayload>=0 );
   assert( pPage->maxLocal <= BT_MAX_LOCAL );
   if( nPayload<=pPage->maxLocal ){
     /* This is the (easy) common case where the entire payload fits

src/json.c

@@ -1208,11 +1208,11 @@ static void jsonBlobAppendOneByte(JsonParse *pParse, u8 c){
 /* Slow version of jsonBlobAppendNode() that first resizes the
 ** pParse->aBlob structure.
 */
-static void jsonBlobAppendNode(JsonParse*,u8,u32,const void*);
+static void jsonBlobAppendNode(JsonParse*,u8,u64,const void*);
 static SQLITE_NOINLINE void jsonBlobExpandAndAppendNode(
   JsonParse *pParse,
   u8 eType,
-  u32 szPayload,
+  u64 szPayload,
   const void *aPayload
 ){
   if( jsonBlobExpand(pParse, pParse->nBlob+szPayload+9) ) return;
@@ -1232,7 +1232,7 @@ static SQLITE_NOINLINE void jsonBlobExpandAndAppendNode(
 static void jsonBlobAppendNode(
   JsonParse *pParse,          /* The JsonParse object under construction */
   u8 eType,                   /* Node type.  One of JSONB_* */
-  u32 szPayload,              /* Number of bytes of payload */
+  u64 szPayload,              /* Number of bytes of payload */
   const void *aPayload        /* The payload.  Might be NULL */
 ){
   u8 *a;
@@ -2632,6 +2632,7 @@ static void jsonBlobEdit(
   u32 nIns               /* Bytes of content to insert */
 ){
   i64 d = (i64)nIns - (i64)nDel;
+  assert( pParse->nBlob >= (u64)iDel + (u64)nDel );
   if( d<0 && d>=(-8) && aIns!=0
    && jsonBlobOverwrite(&pParse->aBlob[iDel], aIns, nIns, (int)-d)
   ){