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ext4: fix EFBIG edge case when writing to large non-extent file
By running the following reproducer, we can confirm that the write system call returns with 0 when it should return the error EFBIG. #!/bin/sh /bin/dd if=/dev/zero of=./img bs=1k count=1 seek=1024k > /dev/null 2>&1 /sbin/mkfs.ext3 -Fq ./img /bin/mount -o loop -t ext4 ./img /mnt /bin/touch /mnt/file strace /bin/dd if=/dev/zero of=/mnt/file conv=notrunc bs=1k count=1 seek=$((2194719883264/1024)) 2>&1 | /bin/egrep "write.* 1024\) = " /bin/umount /mnt exit Signed-off-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Eric Sandeen <sandeen@redhat.com>
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@ -70,7 +70,8 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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size_t length = iov_length(iov, nr_segs);
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size_t length = iov_length(iov, nr_segs);
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if (pos > sbi->s_bitmap_maxbytes)
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if ((pos > sbi->s_bitmap_maxbytes ||
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(pos == sbi->s_bitmap_maxbytes && length > 0)))
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return -EFBIG;
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return -EFBIG;
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if (pos + length > sbi->s_bitmap_maxbytes) {
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if (pos + length > sbi->s_bitmap_maxbytes) {
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