Commit 5aa98b70 authored by Jeff Layton's avatar Jeff Layton Committed by Al Viro

vfs: explicitly cast s_maxbytes in fiemap_check_ranges

If fiemap_check_ranges is passed a large enough value, then it's
possible that the value would be cast to a signed value for comparison
against s_maxbytes when we change it to loff_t. Make sure that doesn't
happen by explicitly casting s_maxbytes to an unsigned value for the
purposes of comparison.
Signed-off-by: default avatarJeff Layton <>
Cc: Christoph Hellwig <>
Cc: Robert Love <>
Cc: Al Viro <>
Cc: Johannes Weiner <>
Cc: Mandeep Singh Baines <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarAl Viro <>
parent 05cc0cee
......@@ -162,20 +162,21 @@ EXPORT_SYMBOL(fiemap_check_flags);
static int fiemap_check_ranges(struct super_block *sb,
u64 start, u64 len, u64 *new_len)
u64 maxbytes = (u64) sb->s_maxbytes;
*new_len = len;
if (len == 0)
return -EINVAL;
if (start > sb->s_maxbytes)
if (start > maxbytes)
return -EFBIG;
* Shrink request scope to what the fs can actually handle.
if ((len > sb->s_maxbytes) ||
(sb->s_maxbytes - len) < start)
*new_len = sb->s_maxbytes - start;
if (len > maxbytes || (maxbytes - len) < start)
*new_len = maxbytes - start;
return 0;
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