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authorChristoph Hellwig <hch@lst.de>2017-08-11 22:45:35 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2017-08-12 02:56:33 +0300
commite28ae8e428fefe2facd72cea9f29906ecb9c861d (patch)
treea78610c117be8103f6a1c87ea44327cfab4537fe /fs
parentc44245b3d5435f533ca8346ece65918f84c057f9 (diff)
downloadlinux-e28ae8e428fefe2facd72cea9f29906ecb9c861d.tar.xz
iomap: fix integer truncation issues in the zeroing and dirtying helpers
Fix the min_t calls in the zeroing and dirtying helpers to perform the comparisms on 64-bit types, which prevents them from incorrectly being truncated, and larger zeroing operations being stuck in a never ending loop. Special thanks to Markus Stockhausen for spotting the bug. Reported-by: Paul Menzel <pmenzel@molgen.mpg.de> Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/iomap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/iomap.c b/fs/iomap.c
index 039266128b7f..59cc98ad7577 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -278,7 +278,7 @@ iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
unsigned long bytes; /* Bytes to write to page */
offset = (pos & (PAGE_SIZE - 1));
- bytes = min_t(unsigned long, PAGE_SIZE - offset, length);
+ bytes = min_t(loff_t, PAGE_SIZE - offset, length);
rpage = __iomap_read_page(inode, pos);
if (IS_ERR(rpage))
@@ -373,7 +373,7 @@ iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
unsigned offset, bytes;
offset = pos & (PAGE_SIZE - 1); /* Within page */
- bytes = min_t(unsigned, PAGE_SIZE - offset, count);
+ bytes = min_t(loff_t, PAGE_SIZE - offset, count);
if (IS_DAX(inode))
status = iomap_dax_zero(pos, offset, bytes, iomap);