Fix a potential UAF bug in the zipfile extension.

[bugs:/info/2026-06-03T10:58:51Z|Bug 2026-06-03T10:58:51Z].

FossilOrigin-Name: 1fb5e9169ace6bea2bdf9013f39002c1ce5dc9ce51d6007bec22d91f456c15f0

ext/misc/zipfile.c

@@ -488,6 +488,7 @@ static void zipfileResetCursor(ZipfileCsr *pCsr){
     pNext = p->pNext;
     zipfileEntryFree(p);
   }
+  pCsr->pFreeEntry = 0;
 }
 
 /*

manifest

@@ -1,5 +1,5 @@
-C Fix\snegative\sarray\sindex\sin\s"testing\sand\sdebugging\suses\sonly"\sextension\nqpvtab.c.\n[bugs:/info/2026-06-03T07:26:26Z|Bug\s2026-06-03T07:26:26Z].
-D 2026-06-03T12:43:50.425
+C Fix\sa\spotential\sUAF\sbug\sin\sthe\szipfile\sextension.\n[bugs:/info/2026-06-03T10:58:51Z|Bug\s2026-06-03T10:58:51Z].
+D 2026-06-03T13:12:20.326
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -419,7 +419,7 @@ F ext/misc/vtablog.c 6c0c11c4822ab6c1a205718ea7c6d1bb561d96b27104b9c1fe84d01aa62
 F ext/misc/vtshim.c f5ab480d1e33fa46a0b138359bedc9979e32798d72348e04bbe6093f9ae95c7b
 F ext/misc/wholenumber.c aa5e6d786fe8d79bc100ea0e852249c026a91ae65a5c1bcb2b869cd1a7cdd6d5
 F ext/misc/windirent.h 02211ce51f3034c675f2dbf4d228194d51b3ee05734678bad5106fff6292e60c
-F ext/misc/zipfile.c 38211d2b23e1fcb57af2d7c597458112e6c3d6130bf97dc4c224816d9f8218fa
+F ext/misc/zipfile.c 58d535e6f177709c3f3607e19aa8e1b4c3c57c1f2c78bd4cdfac15e0b2f53e5a
 F ext/misc/zorder.c bddff2e1b9661a90c95c2a9a9c7ecd8908afab5763256294dd12d609d4664eee
 F ext/qrf/README.md 9e644615d7d7b77ef7e9db798765679e50c5ed12eda48bce21c9ef9eb4715e9d
 F ext/qrf/dev-notes.md e68a6d91ce4c7eb296ef2daadc2bb79c95c317ad15b9fafe40850c67b29c2430
@@ -2109,7 +2109,7 @@ F test/writecrash.test 13520af28f376bfc8c0bcd130efc1fff20bb165198e8b94cf153f1f75
 F test/zeroblob.test 7b74cefc7b281dfa2b07cd237987fbe94b4a2037a7771e9e83f2d5f608b1d99e
 F test/zeroblobfault.test 861d8191a0d944dfebb3cb4d2c5b4e46a5a119eaec5a63dd996c2389f8063441
 F test/zerodamage.test 9c41628db7e8d9e8a0181e59ea5f189df311a9f6ce99cc376dc461f66db6f8dc
-F test/zipfile.test f0d22280f679a53fd0c47e76fc1b4732428be64763efdb119ddb37ffce202d23
+F test/zipfile.test 756af25d30ffd25073b113865f1ebeb12f7edfa5dddd8c37bca70e4c3150ab62
 F test/zipfile2.test 21afaffcf4f7769df38bf16e4a9c4dfa6ba1b0f5b695f844ec61fafb92db0db7
 F test/zipfilefault.test 44d4d7a7f7cca7521d569d7f71026b241d65a6b1757aa409c1a168827edbbc2c
 F tool/GetFile.cs 47852aa0d806fe47ed1ac5138bdce7f000fe87aaa7f28107d0cb1e26682aeb44
@@ -2207,8 +2207,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh a554d13f6e5cf3760f041b87939e3d616ec6961859c3245e8ef701d1eafc2ca2
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P 21369378769195f20f839231f625582552eaa3f79044ca3e3efb7f9476b515a8
-R 976afd00c6a0ed2a76d2acce24fa5cd4
+P d066699fcacd87496645f3aa3c4049935410ae2451879a033102304c80273deb
+R cf30ef725e80b5da70b496c1747bf479
 U drh
-Z ecf63694b4e2def4351af346475d1135
+Z d5d76c0310a71cb45cf5a887d4acb843
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-d066699fcacd87496645f3aa3c4049935410ae2451879a033102304c80273deb
+1fb5e9169ace6bea2bdf9013f39002c1ce5dc9ce51d6007bec22d91f456c15f0

test/zipfile.test

@@ -990,5 +990,16 @@ do_catchsql_test 24.2 {
   SELECT * FROM zipfile(unhex($zip))
 } {1 {zip archive is corrupt}}
 
-finish_test
+# Bug 2026-06-03T10:58:51Z
+do_catchsql_test 25.0 {
+  WITH t(v) AS (
+    SELECT unhex(
+     '504B03041400000000000000000000000000000000000000000001000000
+      61504B01021E031400000000000000000000000000000000000000000001
+      000000000000000000000000000000000061504B05060000000001000100
+      2F0000001F0000000000',char(10,13,32))
+    UNION ALL SELECT 'x'
+  ) SELECT z.name FROM t, zipfile(t.v) AS z;
+} {1 {cannot open file: x}}
 
+finish_test