e2fsprogs/SOURCES/e2fsprogs-1.45.6-filefrag-handle-invalid-st_dev-and-blksize-cases.patch

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2022-11-08 06:56:31 +00:00
From 381bc5d98b2a8a65b1f559e31e67361a761aefee Mon Sep 17 00:00:00 2001
From: Luis Henriques <lhenriques@suse.de>
Date: Wed, 28 Oct 2020 15:55:50 +0000
Subject: [PATCH 14/46] filefrag: handle invalid st_dev and blksize cases
Content-Type: text/plain
It is possible to crash filefrag with a "Floating point exception" in
two different scenarios:
1. When fstat() returns a device ID set to 0
2. When FIGETBSZ ioctl returns a blocksize of 0
In both scenarios a divide-by-zero will occur in frag_report() because
variable blksize will be set to zero.
I've managed to trigger this crash with an old CephFS kernel client,
using xfstest generic/519. The first scenario has been fixed by kernel
commit 75c9627efb72 ("ceph: map snapid to anonymous bdev ID"). The
second scenario is also fixed with commit 8f97d1e99149 ("vfs: fix
FIGETBSZ ioctl on an overlayfs file").
However, it is desirable to handle these two scenarios gracefully by
checking these conditions explicitly.
Signed-off-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
misc/filefrag.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/misc/filefrag.c b/misc/filefrag.c
index 032535f3..a5b9bfe9 100644
--- a/misc/filefrag.c
+++ b/misc/filefrag.c
@@ -418,13 +418,13 @@ static int frag_report(const char *filename)
goto out_close;
}
- if (last_device != st.st_dev) {
+ if ((last_device != st.st_dev) || !st.st_dev) {
if (fstatfs(fd, &fsinfo) < 0) {
rc = -errno;
perror("fstatfs");
goto out_close;
}
- if (ioctl(fd, FIGETBSZ, &blksize) < 0)
+ if ((ioctl(fd, FIGETBSZ, &blksize) < 0) || !blksize)
blksize = fsinfo.f_bsize;
if (verbose)
printf("Filesystem type is: %lx\n",
--
2.35.1