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authorMiklos Szeredi <mszeredi@redhat.com>2019-11-12 11:49:04 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2019-11-12 11:49:04 +0100
commit8aab336b14c115c6bf1d4baeb9247e41ed9ce6de (patch)
tree9ef38407dc83b5ba4b04522a576c5132d872631d /fs/fuse
parenteb59bd17d2fa6e5e84fba61a5ebdea984222e6d5 (diff)
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fuse: verify write return
Make sure filesystem is not returning a bogus number of bytes written. Fixes: ea9b9907b82a ("fuse: implement perform_write") Cc: <stable@vger.kernel.org> # v2.6.26 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index db48a5cf8620..795d0f24d8b4 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1096,6 +1096,8 @@ static ssize_t fuse_send_write_pages(struct fuse_io_args *ia,
ia->write.in.flags = fuse_write_flags(iocb);
err = fuse_simple_request(fc, &ap->args);
+ if (!err && ia->write.out.size > count)
+ err = -EIO;
offset = ap->descs[0].offset;
count = ia->write.out.size;