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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3e04:b0:433:7d37:38ea with SMTP id e9e14a558f8ab-43473dae01emr61075365ab.24.1763007988701; Wed, 12 Nov 2025 20:26:28 -0800 (PST) Date: Wed, 12 Nov 2025 20:26:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69155df4.a70a0220.3124cb.0016.GAE@google.com> Subject: [syzbot] [cifs?] memory leak in smb3_fs_context_fullpath From: syzbot To: bharathsm@microsoft.com, linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, pc@manguebit.org, ronniesahlberg@gmail.com, samba-technical@lists.samba.org, sfrench@samba.org, sprasad@microsoft.com, syzkaller-bugs@googlegroups.com, tom@talpey.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4ea7c1717f3f Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b75c12580000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809 dashboard link: https://syzkaller.appspot.com/bug?extid=87be6809ed9bf6d718e3 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15350658580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160d960a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1f8cf51c9042/disk-4ea7c171.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6f227246b5b7/vmlinux-4ea7c171.xz kernel image: https://storage.googleapis.com/syzbot-assets/f935766a00b3/bzImage-4ea7c171.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+87be6809ed9bf6d718e3@syzkaller.appspotmail.com 2025/11/11 03:33:01 executed programs: 5 BUG: memory leak unreferenced object 0xffff888110616300 (size 192): comm "syz.0.17", pid 6091, jiffies 4294942682 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888110616180 (size 192): comm "syz.0.17", pid 6091, jiffies 4294942682 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5755 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888128172cc0 (size 192): comm "syz.0.18", pid 6093, jiffies 4294942683 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888128172180 (size 192): comm "syz.0.18", pid 6093, jiffies 4294942683 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5755 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888128172000 (size 192): comm "syz.0.19", pid 6098, jiffies 4294942685 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff8881281723c0 (size 192): comm "syz.0.19", pid 6098, jiffies 4294942685 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5755 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888128172c00 (size 192): comm "syz.0.20", pid 6128, jiffies 4294943222 hex dump (first 32 bytes): 2f 2f f2 2f 06 08 2f df 2f 6f dc ea 95 9a 82 10 //./.././o...... 97 57 8f 37 98 9b 2f f9 0d 6d 44 94 29 55 db 15 .W.7../..mD.)U.. backtrace (crc 93bb458c): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438 vfs_parse_fs_param+0xf4/0x190 fs/fs_context.c:146 vfs_fsconfig_locked fs/fsopen.c:303 [inline] __do_sys_fsconfig+0x7d3/0x900 fs/fsopen.c:473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup