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scsi: lpfc: Prevent lpfc_debugfs_lockstat_write() buffer overflow

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[ Upstream commit c6087b82a9 ]

A static code analysis tool flagged the possibility of buffer overflow when
using copy_from_user() for a debugfs entry.

Currently, it is possible that copy_from_user() copies more bytes than what
would fit in the mybuf char array.  Add a min() restriction check between
sizeof(mybuf) - 1 and nbytes passed from the userspace buffer to protect
against buffer overflow.

Link: https://lore.kernel.org/r/20230301231626.9621-2-justintee8345@gmail.com
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Justin Tee 2023-03-01 15:16:17 -08:00 • committed by Greg Kroah-Hartman
commit e0e7faee3a
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/lpfc/lpfc_debugfs.c
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@ -2159,10 +2159,13 @@ lpfc_debugfs_lockstat_write(struct file *file, const char __user *buf,
char mybuf[64];
char *pbuf;
int i;
size_t bsize;
memset(mybuf, 0, sizeof(mybuf));
if (copy_from_user(mybuf, buf, nbytes))
bsize = min(nbytes, (sizeof(mybuf) - 1));
if (copy_from_user(mybuf, buf, bsize))
return -EFAULT;
pbuf = &mybuf[0];
@ -2183,7 +2186,7 @@ lpfc_debugfs_lockstat_write(struct file *file, const char __user *buf,
qp->lock_conflict.wq_access = 0;
}
}
return nbytes;
return bsize;
}
#endif