From 398d5843c03261a2b68730f2f00643826bcec6ba Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 14 Feb 2023 16:08:39 -0800 Subject: cifs: Convert struct fealist away from 1-element array The kernel is globally removing the ambiguous 0-length and 1-element arrays in favor of flexible arrays, so that we can gain both compile-time and run-time array bounds checking[1]. While struct fealist is defined as a "fake" flexible array (via a 1-element array), it is only used for examination of the first array element. Walking the list is performed separately, so there is no reason to treat the "list" member of struct fealist as anything other than a single entry. Adjust the struct and code to match. Additionally, struct fea uses the "name" member either as a dynamic string, or is manually calculated from the start of the struct. Redefine the member as a flexible array. No machine code output differences are produced after these changes. [1] For lots of details, see both: https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays https://people.kernel.org/kees/bounded-flexible-arrays-in-c Cc: Steve French Cc: Paulo Alcantara Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Kees Cook Signed-off-by: Steve French --- fs/cifs/cifspdu.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/cifs/cifspdu.h') diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h index 623caece2b10..add73be4902c 100644 --- a/fs/cifs/cifspdu.h +++ b/fs/cifs/cifspdu.h @@ -2583,7 +2583,7 @@ struct fea { unsigned char EA_flags; __u8 name_len; __le16 value_len; - char name[1]; + char name[]; /* optionally followed by value */ } __attribute__((packed)); /* flags for _FEA.fEA */ @@ -2591,7 +2591,7 @@ struct fea { struct fealist { __le32 list_len; - struct fea list[1]; + struct fea list; } __attribute__((packed)); /* used to hold an arbitrary blob of data */ -- cgit v1.2.3