[android-common:android14-6.1 7/7] fs/incfs/pseudo_files.c:1076:22: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot <lkp@intel.com>]

tree:   https://android.googlesource.com/kernel/common android14-6.1
head:   c0665c721df9b82c4652604d24aa91456058230b
commit: e302f3a21b6554722c72787fddc4780c0280e88b [7/7] ANDROID: incremental-fs: Make work with 16k pages
config: arm64-randconfig-r122-20260324 (https://download.01.org/0day-ci/archive/20260324/202603241635.VXniY6dM-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 10.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260324/202603241635.VXniY6dM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603241635.VXniY6dM-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/incfs/pseudo_files.c:1076:22: sparse: sparse: Using plain integer as NULL pointer

vim +1076 fs/incfs/pseudo_files.c

  1066	
  1067	static ssize_t log_read(struct file *f, char __user *buf, size_t len,
  1068				loff_t *ppos)
  1069	{
  1070		struct log_file_state *log_state = f->private_data;
  1071		struct mount_info *mi = get_mount_info(file_superblock(f));
  1072		int total_reads_collected = 0;
  1073		int rl_size;
  1074		ssize_t result = 0;
  1075		bool report_uid;
> 1076		void *page = 0;
  1077		struct incfs_pending_read_info *reads_buf = NULL;
  1078		struct incfs_pending_read_info2 *reads_buf2 = NULL;
  1079		size_t record_size;
  1080		ssize_t reads_to_collect;
  1081		ssize_t reads_per_page;
  1082	
  1083		if (!mi)
  1084			return -EFAULT;
  1085	
  1086		report_uid = mi->mi_options.report_uid;
  1087		record_size = report_uid ? sizeof(*reads_buf2) : sizeof(*reads_buf);
  1088		reads_to_collect = len / record_size;
  1089		reads_per_page = INCFS_DATA_FILE_BLOCK_SIZE / record_size;
  1090	
  1091		rl_size = READ_ONCE(mi->mi_log.rl_size);
  1092		if (rl_size == 0)
  1093			return 0;
  1094	
  1095		page = kzalloc(INCFS_DATA_FILE_BLOCK_SIZE, GFP_NOFS);
  1096		if (!page)
  1097			return -ENOMEM;
  1098	
  1099		if (report_uid)
  1100			reads_buf2 = (struct incfs_pending_read_info2 *)page;
  1101		else
  1102			reads_buf = (struct incfs_pending_read_info *)page;
  1103	
  1104		reads_to_collect = min_t(ssize_t, rl_size, reads_to_collect);
  1105		while (reads_to_collect > 0) {
  1106			struct read_log_state next_state;
  1107			int reads_collected;
  1108	
  1109			memcpy(&next_state, &log_state->state, sizeof(next_state));
  1110			reads_collected = incfs_collect_logged_reads(
  1111				mi, &next_state, reads_buf, reads_buf2,
  1112				min_t(ssize_t, reads_to_collect, reads_per_page));
  1113			if (reads_collected <= 0) {
  1114				result = total_reads_collected ?
  1115					       total_reads_collected * record_size :
  1116					       reads_collected;
  1117				goto out;
  1118			}
  1119			if (copy_to_user(buf, page,
  1120					 reads_collected * record_size)) {
  1121				result = total_reads_collected ?
  1122					       total_reads_collected * record_size :
  1123					       -EFAULT;
  1124				goto out;
  1125			}
  1126	
  1127			memcpy(&log_state->state, &next_state, sizeof(next_state));
  1128			total_reads_collected += reads_collected;
  1129			buf += reads_collected * record_size;
  1130			reads_to_collect -= reads_collected;
  1131		}
  1132	
  1133		result = total_reads_collected * record_size;
  1134		*ppos = 0;
  1135	out:
  1136		kfree(page);
  1137		return result;
  1138	}
  1139	

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