From: Manfred Spraul sendfile supports reading from a given start offset for in_file, like pread. But for the locks_verify_area call, in_file->f_pos is always used, even if a start offset is used. Result: wrong area is checked for mandatory locks. --- fs/read_write.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-) diff -puN fs/read_write.c~sendfile-locks_verify_area-fix fs/read_write.c --- 25/fs/read_write.c~sendfile-locks_verify_area-fix 2004-01-18 16:08:25.000000000 -0800 +++ 25-akpm/fs/read_write.c 2004-01-18 16:08:25.000000000 -0800 @@ -559,7 +559,9 @@ static ssize_t do_sendfile(int out_fd, i goto fput_in; if (!in_file->f_op || !in_file->f_op->sendfile) goto fput_in; - retval = locks_verify_area(FLOCK_VERIFY_READ, in_inode, in_file, in_file->f_pos, count); + if (!ppos) + ppos = &in_file->f_pos; + retval = locks_verify_area(FLOCK_VERIFY_READ, in_inode, in_file, *ppos, count); if (retval) goto fput_in; @@ -588,9 +590,6 @@ static ssize_t do_sendfile(int out_fd, i if (retval) goto fput_out; - if (!ppos) - ppos = &in_file->f_pos; - if (!max) max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); _