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UPSTREAM: fs: avoid possible NULL dereference in fs_devread 

It is unwise to first dereference a variable
and then to check if it was NULL.

Change-Id: I2c28e092380c649874fab06f0b4e453466e2d16c
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Marek Behun <marek.behun@nic.cz>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 24f48416dfe1d827dcf759d6cd0e7a8e5c67e321)
This commit is contained in:
Heinrich Schuchardt 2017-11-19 23:49:21 +01:00 committed by Kever Yang
parent 6ff3d5909f
commit 1759abcc94
1 changed files with 2 additions and 1 deletions
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3
fs/fs_internal.c
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@ -15,12 +15,13 @@ int fs_devread(struct blk_desc *blk, disk_partition_t *partition,
lbaint_t sector, int byte_offset, int byte_len, char *buf)
{
unsigned block_len;
int log2blksz = blk->log2blksz;
int log2blksz;
ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (blk ? blk->blksz : 0));
if (blk == NULL) {
printf("** Invalid Block Device Descriptor (NULL)\n");
return 0;
}
log2blksz = blk->log2blksz;
/* Check partition boundaries */
if ((sector + ((byte_offset + byte_len - 1) >> log2blksz))