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f2fs: fix null pointer panic in tracepoint in __replace_atomic_write_block
We got a kernel panic if old_addr is NULL.
https://bugzilla.kernel.org/show_bug.cgi?id=217266
BUG: kernel NULL pointer dereference, address: 0000000000000000
Call Trace:
<TASK>
f2fs_commit_atomic_write+0x619/0x990 [f2fs a1b985b80f5babd6f3ea778384908880812bfa43]
__f2fs_ioctl+0xd8e/0x4080 [f2fs a1b985b80f5babd6f3ea778384908880812bfa43]
? vfs_write+0x2ae/0x3f0
? vfs_write+0x2ae/0x3f0
__x64_sys_ioctl+0x91/0xd0
do_syscall_64+0x5c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f69095fe53f
Fixes: 2f3a9ae990
("f2fs: introduce trace_f2fs_replace_atomic_write_block")
Cc: <stable@vger.kernel.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
parent
144f1cd40b
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@ -257,7 +257,7 @@ static int __replace_atomic_write_block(struct inode *inode, pgoff_t index,
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f2fs_put_dnode(&dn);
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trace_f2fs_replace_atomic_write_block(inode, F2FS_I(inode)->cow_inode,
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index, *old_addr, new_addr, recover);
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index, old_addr ? *old_addr : 0, new_addr, recover);
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return 0;
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}
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