David Disseldorp <ddiss@xxxxxxx> writes: > cifs_smb3_do_mount() calls smb3_fs_context_dup() and then > cifs_setup_volume_info(). The latter's subsequent smb3_parse_devname() > call overwrites the cifs_sb->ctx->UNC string already dup'ed by > smb3_fs_context_dup(), resulting in a leak. E.g. > > unreferenced object 0xffff888002980420 (size 32): > comm "mount", pid 160, jiffies 4294892541 (age 30.416s) > hex dump (first 32 bytes): > 5c 5c 31 39 32 2e 31 36 38 2e 31 37 34 2e 31 30 \\192.168.174.10 > 34 5c 72 61 70 69 64 6f 2d 73 68 61 72 65 00 00 4\rapido-share.. > backtrace: > [<00000000069e12f6>] kstrdup+0x28/0x50 > [<00000000b61f4032>] smb3_fs_context_dup+0x127/0x1d0 [cifs] > [<00000000c6e3e3bf>] cifs_smb3_do_mount+0x77/0x660 [cifs] > [<0000000063467a6b>] smb3_get_tree+0xdf/0x220 [cifs] > [<00000000716f731e>] vfs_get_tree+0x1b/0x90 > [<00000000491d3892>] path_mount+0x62a/0x910 > [<0000000046b2e774>] do_mount+0x50/0x70 > [<00000000ca7b64dd>] __x64_sys_mount+0x81/0xd0 > [<00000000b5122496>] do_syscall_64+0x33/0x40 > [<000000002dd397af>] entry_SYSCALL_64_after_hwframe+0x44/0xae > > This change is a bandaid until the cifs_setup_volume_info() TODO and > error handling issues are resolved. > > Signed-off-by: David Disseldorp <ddiss@xxxxxxx> > --- > fs/cifs/cifsfs.c | 6 ++++++ > 1 file changed, 6 insertions(+) Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
