6.12-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon linkinjeon@kernel.org
commit 95d7a890e4b03e198836d49d699408fd1867cb55 upstream.
The smb2_set_ea function, which handles Extended Attributes (EA), was performing buffer validation checks that incorrectly omitted the size of the null terminating character (+1 byte) for EA Name. This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where the null terminator is expected to be present in the buffer, ensuring the validation accurately reflects the total required buffer size.
Cc: stable@vger.kernel.org Reported-by: Roger roger.andersen@protonmail.com Reported-by: Stanislas Polu spolu@dust.tt Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/server/smb2pdu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -2363,7 +2363,7 @@ static int smb2_set_ea(struct smb2_ea_in int rc = 0; unsigned int next = 0;
- if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength + + if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength + 1 + le16_to_cpu(eabuf->EaValueLength)) return -EINVAL;
@@ -2440,7 +2440,7 @@ next: break; }
- if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength + + if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength + 1 + le16_to_cpu(eabuf->EaValueLength)) { rc = -EINVAL; break;