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memory leak in smb3_fs_context_fullpath

Status: upstream: reported C repro on 2025/11/13 04:26
Subsystems: cifs
[Documentation on labels]
Reported-by: syzbot+87be6809ed9bf6d718e3@syzkaller.appspotmail.com
Fix commit: cifs: fix memory leak in smb3_fs_context_parse_param error path
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 10d, last: 10d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] cifs: fix memory leak in smb3_fs_context_parse_param error path 3 (3) 2025/11/21 12:39
[syzbot] [cifs?] memory leak in smb3_fs_context_fullpath 4 (8) 2025/11/18 12:10
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/11/18 11:38 22m ssranevjti@gmail.com patch upstream OK log
2025/11/18 11:23 1m ssranevjti@gmail.com patch upstream error
2025/11/18 08:59 8m ssranevjti@gmail.com patch upstream error

Sample crash report:
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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/11 03:33 upstream 4ea7c1717f3f 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in smb3_fs_context_fullpath
* Struck through repros no longer work on HEAD.