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| author | Christoph Hellwig <hch@lst.de> | 2017-08-11 12:45:35 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-08-11 16:56:33 -0700 |
| commit | e28ae8e428fefe2facd72cea9f29906ecb9c861d (patch) | |
| tree | a78610c117be8103f6a1c87ea44327cfab4537fe | |
| parent | c44245b3d5435f533ca8346ece65918f84c057f9 (diff) | |
| download | linux-e28ae8e428fefe2facd72cea9f29906ecb9c861d.tar.gz linux-e28ae8e428fefe2facd72cea9f29906ecb9c861d.tar.bz2 linux-e28ae8e428fefe2facd72cea9f29906ecb9c861d.zip | |
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>
| -rw-r--r-- | fs/iomap.c | 4 |
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); |