Kernel bug: memory leak in smb3_fs_context_parse_param
Subsystem: cifs
Status: fixed

Crash report:
2025/11/07 05:48:37 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888108910420 (size 96):
  comm "syz.0.17", pid 6085, jiffies 4294942570
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5751
    __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 0xffff888128afa060 (size 96):
  comm "syz.0.18", pid 6087, jiffies 4294942571
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5751
    __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 0xffff888128afa300 (size 96):
  comm "syz.0.19", pid 6090, jiffies 4294942572
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
    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 0xffff888128afa360 (size 96):
  comm "syz.0.19", pid 6090, jiffies 4294942572
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5751
    __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 0xffff888112c7d900 (size 96):
  comm "syz.0.21", pid 6128, jiffies 4294943114
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
    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 0xffff888112c7d420 (size 96):
  comm "syz.0.21", pid 6128, jiffies 4294943114
  hex dump (first 32 bytes):
    2f 2f f2 62 06 08 ba df 58 6f dc ea 95 9a 9b 2f  //.b....Xo...../
    51 39 f9 0d 6d 44 94 29 55 db 15 58 2e 49 0a 7d  Q9..mD.)U..X.I.}
  backtrace (crc 79c9c7ba):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __do_kmalloc_node mm/slub.c:5641 [inline]
    __kmalloc_node_track_caller_noprof+0x3aa/0x6b0 mm/slub.c:5751
    __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

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF