Even tighter bounds on the maximum length of the filename for

sqlite3_load_extension().

FossilOrigin-Name: 787291414d2d2082a3c63e7cdd6bec4719f0c8b75ad1355f5026932ecbb28ba8

manifest

@@ -1,5 +1,5 @@
-C Tighter\sconstraints\son\sthe\smaximum\slength\sof\sthe\sfilename\shanded\sover\nto\ssqlite3_load_extension(),\sdue\sto\n[forum:/forumpost/a43074729e|forum\spost\sa43074729e].\s\sThis\sis\sa\nfollow-on\sto\s[01f3877c7172d522]\sand\n[forum:/forumpost/08a0d6d9bf|forum\spost\s08a0d6d9bf].
-D 2023-03-25T03:17:08.825
+C Even\stighter\sbounds\son\sthe\smaximum\slength\sof\sthe\sfilename\sfor\nsqlite3_load_extension().
+D 2023-03-25T12:27:36.520
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -587,7 +587,7 @@ F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c 7940fce7d4aa855606432d82d20694e17c18a03956f5f5776f2404e2df7c18a8
 F src/json.c 9e3a6acf9e4fa8bb6c84a38538ed9c2f9ad09f106910ef0e9cc68e19c8dc4fc8
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
-F src/loadext.c fb07842759d6b44d4d4579afba8738eefd3d1895ec1bc9762a570c989e5db75e
+F src/loadext.c be5af440f3192c58681b5d43167dbca3ccbfce394d89faa22378a14264781136
 F src/main.c 09bc5191f75dc48fc4dfddda143cb864c0c3dbc3297eb9a9c8e01fea58ff847d
 F src/malloc.c 47b82c5daad557d9b963e3873e99c22570fb470719082c6658bf64e3012f7d23
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
@@ -2051,8 +2051,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P a6e218a6e1ddd74be6a313b1d336334071747efd4ecd354ed7efe303d09c849c
-R 0a897a9ea5887cea19fc58ed2eebee3b
+P 9f351bdee2a09a4419bb8256a13d1f757b3e00ec26a445523f224fc56d9ae26d
+R 40c0be8beff032c6896e7e0265e6be39
 U drh
-Z 873f4ab64a73df2a4c85c82566d6faec
+Z 073a667407358758809a055e67c88eb4
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-9f351bdee2a09a4419bb8256a13d1f757b3e00ec26a445523f224fc56d9ae26d
+787291414d2d2082a3c63e7cdd6bec4719f0c8b75ad1355f5026932ecbb28ba8

src/loadext.c

@@ -590,14 +590,16 @@ static int sqlite3LoadExtension(
   ** Later (2023-03-25): Save an extra 6 bytes for the filename suffix.
   ** See https://sqlite.org/forum/forumpost/24083b579d.
   */
-  if( nMsg>SQLITE_MAX_PATHLEN-6 ) goto extension_not_found;
+  if( nMsg>SQLITE_MAX_PATHLEN ) goto extension_not_found;
     
   handle = sqlite3OsDlOpen(pVfs, zFile);
 #if SQLITE_OS_UNIX || SQLITE_OS_WIN
   for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){
     char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]);
     if( zAltFile==0 ) return SQLITE_NOMEM_BKPT;
-    handle = sqlite3OsDlOpen(pVfs, zAltFile);
+    if( nMsg+strlen(azEndings[ii])+1<=SQLITE_MAX_PATHLEN ){
+      handle = sqlite3OsDlOpen(pVfs, zAltFile);
+    }
     sqlite3_free(zAltFile);
   }
 #endif