[ Sasha's backport helper bot ] Hi, The upstream commit SHA1 provided is correct: e2a8910af01653c1c268984855629d71fb81f404 WARNING: Author mismatch between patch and upstream commit: Backport author: Mahmoud Adam <mngyadam@xxxxxxxxxx> Commit author: Pali Rohár <pali@xxxxxxxxxx> Status in newer kernel trees: 6.12.y | Present (exact SHA1) 6.11.y | Present (different SHA1: c173d47b69f0) 6.6.y | Present (different SHA1: c6db81c550ce) 6.1.y | Present (different SHA1: 08461ff8be1c) 5.15.y | Present (different SHA1: 6bddea684ef2) Note: The patch differs from the upstream commit: --- --- - 2024-11-25 08:41:08.697150675 -0500 +++ /tmp/tmp.5TBHo3EDHj 2024-11-25 08:41:08.686554930 -0500 @@ -1,3 +1,5 @@ +commit e2a8910af01653c1c268984855629d71fb81f404 upstream. + ReparseDataLength is sum of the InodeType size and DataBuffer size. So to get DataBuffer size it is needed to subtract InodeType's size from ReparseDataLength. @@ -18,48 +20,32 @@ Reviewed-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx> Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> +[use variable name symlink_buf, the other buf->InodeType accesses are +not used in current version so skip] +Signed-off-by: Mahmoud Adam <mngyadam@xxxxxxxxxx> --- - fs/smb/client/reparse.c | 15 ++++++++++++++- - 1 file changed, 14 insertions(+), 1 deletion(-) +v2: fix upstream format. +https://lore.kernel.org/stable/20241122152943.76044-1-mngyadam@xxxxxxxxxx/ + fs/cifs/smb2ops.c | 6 ++++++ + 1 file changed, 6 insertions(+) -diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c -index 3b48a093cfb1f..8ea7a848aa393 100644 ---- a/fs/smb/client/reparse.c -+++ b/fs/smb/client/reparse.c -@@ -320,9 +320,16 @@ static int parse_reparse_posix(struct reparse_posix_data *buf, - unsigned int len; - u64 type; +diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c +index 9ec67b76bc062..4f7639afa7627 100644 +--- a/fs/cifs/smb2ops.c ++++ b/fs/cifs/smb2ops.c +@@ -2807,6 +2807,12 @@ parse_reparse_posix(struct reparse_posix_data *symlink_buf, -+ len = le16_to_cpu(buf->ReparseDataLength); -+ if (len < sizeof(buf->InodeType)) { + /* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */ + len = le16_to_cpu(symlink_buf->ReparseDataLength); ++ if (len < sizeof(symlink_buf->InodeType)) { + cifs_dbg(VFS, "srv returned malformed nfs buffer\n"); + return -EIO; + } + -+ len -= sizeof(buf->InodeType); -+ - switch ((type = le64_to_cpu(buf->InodeType))) { - case NFS_SPECFILE_LNK: -- len = le16_to_cpu(buf->ReparseDataLength); - data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer, - len, true, - cifs_sb->local_nls); -@@ -482,12 +489,18 @@ bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb, - u32 tag = data->reparse.tag; ++ len -= sizeof(symlink_buf->InodeType); - if (tag == IO_REPARSE_TAG_NFS && buf) { -+ if (le16_to_cpu(buf->ReparseDataLength) < sizeof(buf->InodeType)) -+ return false; - switch (le64_to_cpu(buf->InodeType)) { - case NFS_SPECFILE_CHR: -+ if (le16_to_cpu(buf->ReparseDataLength) != sizeof(buf->InodeType) + 8) -+ return false; - fattr->cf_mode |= S_IFCHR; - fattr->cf_rdev = reparse_mkdev(buf->DataBuffer); - break; - case NFS_SPECFILE_BLK: -+ if (le16_to_cpu(buf->ReparseDataLength) != sizeof(buf->InodeType) + 8) -+ return false; - fattr->cf_mode |= S_IFBLK; - fattr->cf_rdev = reparse_mkdev(buf->DataBuffer); - break; + if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) { + cifs_dbg(VFS, "%lld not a supported symlink type\n", +-- +2.40.1 + --- Results of testing on various branches: | Branch | Patch Apply | Build Test | |---------------------------|-------------|------------| | stable/linux-5.15.y | Success | Success | | stable/linux-5.10.y | Success | Success | | stable/linux-5.4.y | Success | Success |
