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filemap: filemap_read() should check that the offset is positive or zero

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We do check that the read offset is less than the filesystem limit,
however for good measure we should also check that it is positive or
zero, and return EINVAL if that is not the case.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Link: https://lore.kernel.org/r/482ee0b8a30b62324adb9f7c551a99926f037393.1726257832.git.trond.myklebust@hammerspace.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Trond Myklebust
2024-09-13 16:04:18 -04:00
committed by Christian Brauner
parent 2b2b1a20db
commit 9d926f10b7
1 changed files with 2 additions and 0 deletions
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2
mm/filemap.c
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@@ -2620,6 +2620,8 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
loff_t isize, end_offset;
loff_t last_pos = ra->prev_pos;
if (unlikely(iocb->ki_pos < 0))
return -EINVAL;
if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))
return 0;
if (unlikely(!iov_iter_count(iter)))