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ovl: fix lseek overflow on 32bit 

ovl_lseek() is using ssize_t to return the value from vfs_llseek().  On a
32-bit kernel ssize_t is a 32-bit signed int, which overflows above 2 GB.

Assign the return value of vfs_llseek() to loff_t to fix this.

Reported-by: Boris Gjenero <boris.gjenero@gmail.com>
Fixes: 9e46b840c7 ("ovl: support stacked SEEK_HOLE/SEEK_DATA")
Cc: <stable@vger.kernel.org> # v4.19
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
alistair/sensors
Miklos Szeredi 2020-02-03 11:41:53 +01:00
parent 1a980b8cbf
commit a4ac9d45c0
1 changed files with 1 additions and 1 deletions
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fs/overlayfs/file.c
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@ -157,7 +157,7 @@ static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
struct inode *inode = file_inode(file);
struct fd real;
const struct cred *old_cred;
ssize_t ret;
loff_t ret;
/*
* The two special cases below do not need to involve real fs,