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| author | Ronnie Sahlberg <lsahlber@redhat.com> | 2018-10-25 15:43:36 +1000 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-11-02 14:09:41 -0500 |
| commit | 0c5d6cb6643f48ad3775322f3ebab6c7eb67484e (patch) | |
| tree | 708f90365fd6d08b197801a8a4d7424b3b87831c | |
| parent | 5f21585384a4a69b8bfdd2cae7e3648ae805f57d (diff) | |
| download | linux-0c5d6cb6643f48ad3775322f3ebab6c7eb67484e.tar.gz | |
cifs: fix return value for cifs_listxattr
If the application buffer was too small to fit all the names we would still count the number of bytes and return this for listxattr. This would then trigger a BUG in usercopy.c Fix the computation of the size so that we return -ERANGE correctly when the buffer is too small. This fixes the kernel BUG for xfstest generic/377 Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com>
| -rw-r--r-- | fs/cifs/smb2ops.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 23c0a21a66f8..8489b5f706c3 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -747,6 +747,7 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size, int rc = 0; unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0; char *name, *value; + size_t buf_size = dst_size; size_t name_len, value_len, user_name_len; while (src_size > 0) { @@ -782,9 +783,10 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size, /* 'user.' plus a terminating null */ user_name_len = 5 + 1 + name_len; - rc += user_name_len; - - if (dst_size >= user_name_len) { + if (buf_size == 0) { + /* skip copy - calc size only */ + rc += user_name_len; + } else if (dst_size >= user_name_len) { dst_size -= user_name_len; memcpy(dst, "user.", 5); dst += 5; @@ -792,8 +794,7 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size, dst += name_len; *dst = 0; ++dst; - } else if (dst_size == 0) { - /* skip copy - calc size only */ + rc += user_name_len; } else { /* stop before overrun buffer */ rc = -ERANGE; |