fsdax: Fix infinite loop in dax_iomap_rw()
I got an infinite loop and a WARNING report when executing a tail command
in virtiofs.
WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0
Modules linked in:
CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7
Call Trace:
<TASK>
dax_iomap_rw+0xea/0x620
? __this_cpu_preempt_check+0x13/0x20
fuse_dax_read_iter+0x47/0x80
fuse_file_read_iter+0xae/0xd0
new_sync_read+0xfe/0x180
? 0xffffffff81000000
vfs_read+0x14d/0x1a0
ksys_read+0x6d/0xf0
__x64_sys_read+0x1a/0x20
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The tail command will call read() with a count of 0. In this case,
iomap_iter() will report this WARNING, and always return 1 which casuing
the infinite loop in dax_iomap_rw().
Fixing by checking count whether is 0 in dax_iomap_rw().
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Wed, 29 Oct 2025 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Fri, 21 Mar 2025 18:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc6:*:*:*:*:*:* |
Thu, 19 Dec 2024 09:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:ca289e0b95af:*:*:*:*:*:*:* |
|
| Vendors & Products |
Linux
Linux linux Kernel |
|
| Metrics |
ssvc
|
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-05-11T18:44:10.998Z
Reserved: 2024-02-25T13:44:28.315Z
Link: CVE-2022-48635
Updated: 2024-08-03T15:17:55.386Z
Status : Modified
Published: 2024-04-28T13:15:06.663
Modified: 2025-10-29T14:15:49.460
Link: CVE-2022-48635
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