From: Bui Quang Minh minhquangbui99@gmail.com
stable inclusion from stable-v6.6.33 commit 204714e68015d6946279719fd464ecaf57240f35 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 13d0cecb4626fae67c00c84d3c7851f6b62f7df3 ]
Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from userspace to that buffer. Later, we use sscanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using sscanf. Fix this issue by using memdup_user_nul instead of memdup_user.
Fixes: 9f30b674759b ("bfa: replace 2 kzalloc/copy_from_user by memdup_user") Signed-off-by: Bui Quang Minh minhquangbui99@gmail.com Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-3-f1f1b53a10f4@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wang Hai wanghai38@huawei.com --- drivers/scsi/bfa/bfad_debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/bfa/bfad_debugfs.c b/drivers/scsi/bfa/bfad_debugfs.c index 52db147d9979..f6dd077d47c9 100644 --- a/drivers/scsi/bfa/bfad_debugfs.c +++ b/drivers/scsi/bfa/bfad_debugfs.c @@ -250,7 +250,7 @@ bfad_debugfs_write_regrd(struct file *file, const char __user *buf, unsigned long flags; void *kern_buf;
- kern_buf = memdup_user(buf, nbytes); + kern_buf = memdup_user_nul(buf, nbytes); if (IS_ERR(kern_buf)) return PTR_ERR(kern_buf);
@@ -317,7 +317,7 @@ bfad_debugfs_write_regwr(struct file *file, const char __user *buf, unsigned long flags; void *kern_buf;
- kern_buf = memdup_user(buf, nbytes); + kern_buf = memdup_user_nul(buf, nbytes); if (IS_ERR(kern_buf)) return PTR_ERR(kern_buf);