diff options
| author | Rabin Vincent <rabin@rab.in> | 2009-04-05 13:30:53 +0530 |
|---|---|---|
| committer | Andy Fleming <afleming@freescale.com> | 2009-06-02 17:18:56 -0500 |
| commit | e85649c7e683faea1ccfddc9fa9abc62f38e4201 (patch) | |
| tree | ee1f5c96aba8a19b2567d0f542e787f81a1f13f1 | |
| parent | ac0865ff33870cdf2cd480165045e1bc311e9fa2 (diff) | |
mmc: check find_mmc_device return value
find_mmc_device returns NULL if an invalid device number is specified.
Check for this to avoid dereferencing NULL pointers.
Signed-off-by: Rabin Vincent <rabin@rab.in>
| -rw-r--r-- | common/cmd_mmc.c | 9 | ||||
| -rw-r--r-- | drivers/mmc/mmc.c | 2 |
2 files changed, 10 insertions, 1 deletions
diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c index bd55ff1c77..039fe59c75 100644 --- a/common/cmd_mmc.c +++ b/common/cmd_mmc.c @@ -149,6 +149,9 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) int dev = simple_strtoul(argv[2], NULL, 10); struct mmc *mmc = find_mmc_device(dev); + if (!mmc) + return 1; + mmc_init(mmc); return 0; @@ -175,6 +178,9 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) u32 blk = simple_strtoul(argv[4], NULL, 16); struct mmc *mmc = find_mmc_device(dev); + if (!mmc) + return 1; + printf("\nMMC read: dev # %d, block # %d, count %d ... ", dev, blk, cnt); @@ -197,6 +203,9 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) int blk = simple_strtoul(argv[4], NULL, 16); + if (!mmc) + return 1; + printf("\nMMC write: dev # %d, block # %d, count %d ... ", dev, blk, cnt); diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 7791c3896e..70b4130862 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -846,7 +846,7 @@ block_dev_desc_t *mmc_get_dev(int dev) { struct mmc *mmc = find_mmc_device(dev); - return &mmc->block_dev; + return mmc ? &mmc->block_dev : NULL; } int mmc_init(struct mmc *mmc) |