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Mon, 22 Jun 2026 08:14:52 -0700 (PDT) From: Keshav Verma To: Jaegeuk Kim , Chao Yu Cc: Randall Huang , linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Keshav Verma , stable@kernel.org Subject: [PATCH v2] f2fs: fix listxattr handling of corrupted xattr entries Date: Mon, 22 Jun 2026 20:44:21 +0530 Message-Id: <20260622151421.806-1-iganschel@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260618200105.3551-1-iganschel@gmail.com> References: <20260618200105.3551-1-iganschel@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Validate the xattr entry before reading its fields in f2fs_listxattr(). Return -EFSCORRUPTED when the entry is outside the valid xattr storage area instead of returning a successful partial result. Fixes: 688078e7f36c ("f2fs: fix to avoid memory leakage in f2fs_listxattr") Cc: stable@kernel.org Reviewed-by: Chao Yu Signed-off-by: Keshav Verma --- Changes in v2: - Add Fixes tag. - Add Reviewed-by tag. - Add Cc: stable@kernel.org tag. fs/f2fs/xattr.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index 610d5810074d..18f495db20d2 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -581,8 +581,6 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) size_t prefix_len; size_t size; - prefix = f2fs_xattr_prefix(entry->e_name_index, dentry); - if ((void *)(entry) + sizeof(__u32) > last_base_addr || (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) { f2fs_err(F2FS_I_SB(inode), "list inode (%llu) has corrupted xattr", @@ -590,9 +588,12 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); f2fs_handle_error(F2FS_I_SB(inode), ERROR_CORRUPTED_XATTR); - break; + error = -EFSCORRUPTED; + goto cleanup; } + prefix = f2fs_xattr_prefix(entry->e_name_index, dentry); + if (!prefix) continue; -- 2.39.5