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UPSTREAM: ANDROID: fuse-bpf: Fix the issue of abnormal lseek system calls

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fuse_lseek_backing was returning the offset as an int, which would then
be treated as an ERR if in the range 4G-4096 and 4G.

Although the call would appear to work correctly, the file position
would be incorrect according to a subsequent fseek with SEEK_CUR.

Based on a change by chenyuwen <chenyuwen1@meizu.com> who found and
fixed this issue.

Bug: 319219307
Change-Id: I3aef5fb22751a72ce2bd7674ee081956a89fc752
Signed-off-by: chenyuwen <chenyuwen1@meizu.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
This commit is contained in:
Paul Lawrence 2024-01-09 10:02:00 -08:00 • committed by Alexander Martinz
commit 84ab1889e1
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1 changed files with 7 additions and 4 deletions
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11
fs/fuse/backing.c
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@ -454,23 +454,26 @@ int fuse_lseek_backing(struct fuse_bpf_args *fa, struct file *file, loff_t offse
struct file *backing_file = fuse_file->backing_file;
loff_t ret;
/* TODO: Handle changing of the file handle */
if (offset == 0) {
if (whence == SEEK_CUR) {
flo->offset = file->f_pos;
return flo->offset;
return 0;
}
if (whence == SEEK_SET) {
flo->offset = vfs_setpos(file, 0, 0);
return flo->offset;
return 0;
}
}
inode_lock(file->f_inode);
backing_file->f_pos = file->f_pos;
ret = vfs_llseek(backing_file, fli->offset, fli->whence);
flo->offset = ret;
if (!IS_ERR(ERR_PTR(ret))) {
flo->offset = ret;
ret = 0;
}
inode_unlock(file->f_inode);
return ret;
}