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| author | Steve French <stfrench@microsoft.com> | 2022-07-12 11:43:44 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 11:38:21 +0200 |
| commit | 52a408548ab3bd76315f4dc1427430ba0923bf22 (patch) | |
| tree | 85273e07e9567aa89f0478c3d3bd5becb350d334 | |
| parent | 336936f72ab39f89af879909c6d628a4836990ad (diff) | |
| download | linux-52a408548ab3bd76315f4dc1427430ba0923bf22.tar.gz linux-52a408548ab3bd76315f4dc1427430ba0923bf22.tar.bz2 linux-52a408548ab3bd76315f4dc1427430ba0923bf22.zip | |
smb3: check xattr value length earlier
[ Upstream commit 5fa2cffba0b82336a2244d941322eb1627ff787b ]
Coverity complains about assigning a pointer based on
value length before checking that value length goes
beyond the end of the SMB. Although this is even more
unlikely as value length is a single byte, and the
pointer is not dereferenced until laterm, it is clearer
to check the lengths first.
Addresses-Coverity: 1467704 ("Speculative execution data leak")
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/cifs/smb2ops.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index b855abfaaf87..b6d72e3c5eba 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1000,9 +1000,7 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size, size_t name_len, value_len, user_name_len; while (src_size > 0) { - name = &src->ea_data[0]; name_len = (size_t)src->ea_name_length; - value = &src->ea_data[src->ea_name_length + 1]; value_len = (size_t)le16_to_cpu(src->ea_value_length); if (name_len == 0) @@ -1014,6 +1012,9 @@ move_smb2_ea_to_cifs(char *dst, size_t dst_size, goto out; } + name = &src->ea_data[0]; + value = &src->ea_data[src->ea_name_length + 1]; + if (ea_name) { if (ea_name_len == name_len && memcmp(ea_name, name, name_len) == 0) { |