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authorDavid Howells <dhowells@redhat.com>2024-01-08 11:02:55 +0100
committerDavid Howells <dhowells@redhat.com>2024-01-09 14:32:44 +0100
commit3d1d4aa0cc13b1883a5a56c945837a2e0ecb5143 (patch)
tree2c3698e27b5374ee91dbc517fe3bd5793f9d7e2a /fs/cachefiles
parentnetfs: Fix the loop that unmarks folios after writing to the cache (diff)
downloadlinux-3d1d4aa0cc13b1883a5a56c945837a2e0ecb5143.tar.xz
linux-3d1d4aa0cc13b1883a5a56c945837a2e0ecb5143.zip
cachefiles: Fix signed/unsigned mixup
In __cachefiles_prepare_write(), the start and pos variables were made unsigned 64-bit so that the casts in the checking could be got rid of - which should be fine since absolute file offsets can't be negative, except that an error code may be obtained from vfs_llseek(), which *would* be negative. This breaks the error check. Fix this for now by reverting pos and start to be signed and putting back the casts. Unfortunately, the error value checks cannot be replaced with IS_ERR_VALUE() as long might be 32-bits. Fixes: 7097c96411d2 ("cachefiles: Fix __cachefiles_prepare_write()") Reported-by: Simon Horman <horms@kernel.org> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202401071152.DbKqMQMu-lkp@intel.com/ Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> cc: Yiqun Leng <yqleng@linux.alibaba.com> cc: Jia Zhu <zhujia.zj@bytedance.com> cc: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com cc: linux-erofs@lists.ozlabs.org cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org
Diffstat (limited to 'fs/cachefiles')
-rw-r--r--fs/cachefiles/io.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 3eec26967437..9a2cb2868e90 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -522,7 +522,7 @@ int __cachefiles_prepare_write(struct cachefiles_object *object,
bool no_space_allocated_yet)
{
struct cachefiles_cache *cache = object->volume->cache;
- unsigned long long start = *_start, pos;
+ loff_t start = *_start, pos;
size_t len = *_len;
int ret;
@@ -556,7 +556,7 @@ int __cachefiles_prepare_write(struct cachefiles_object *object,
cachefiles_trace_seek_error);
return pos;
}
- if (pos >= start + *_len)
+ if ((u64)pos >= (u64)start + *_len)
goto check_space; /* Unallocated region */
/* We have a block that's at least partially filled - if we're low on
@@ -575,7 +575,7 @@ int __cachefiles_prepare_write(struct cachefiles_object *object,
cachefiles_trace_seek_error);
return pos;
}
- if (pos >= start + *_len)
+ if ((u64)pos >= (u64)start + *_len)
return 0; /* Fully allocated */
/* Partially allocated, but insufficient space: cull. */