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authorRustam Kovhaev <rkovhaev@gmail.com>2021-02-24 12:00:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-24 13:38:26 -0800
commit4dfe6bd94959222e18d512bdf15f6bf9edb9c27c (patch)
tree7039db856343196dec084935e66fcdca3a3aa6eb
parent6bbf29010fa90a7ff22ff14e2875b4e6dea8d576 (diff)
ntfs: check for valid standard information attribute
Mounting a corrupted filesystem with NTFS resulted in a kernel crash. We should check for valid STANDARD_INFORMATION attribute offset and length before trying to access it Link: https://lkml.kernel.org/r/20210217155930.1506815-1-rkovhaev@gmail.com Link: https://syzkaller.appspot.com/bug?extid=c584225dabdea2f71969 Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com> Reported-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com Tested-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com Acked-by: Anton Altaparmakov <anton@tuxera.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ntfs/inode.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 4435dbbc0b63..f5c058b3192c 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -629,6 +629,12 @@ static int ntfs_read_locked_inode(struct inode *vi)
}
a = ctx->attr;
/* Get the standard information attribute value. */
+ if ((u8 *)a + le16_to_cpu(a->data.resident.value_offset)
+ + le32_to_cpu(a->data.resident.value_length) >
+ (u8 *)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(vi->i_sb, "Corrupt standard information attribute in inode.");
+ goto unm_err_out;
+ }
si = (STANDARD_INFORMATION*)((u8*)a +
le16_to_cpu(a->data.resident.value_offset));