luck/tmp_suning_uos_patched
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IB/mthca: Avoid integer overflow when dealing with profile size

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mthca_make_profile() returns the size in bytes of the HCA context
layout it creates, or a negative value if an error occurs.  However,
the return value is declared as u64 and the memfree initialization
path casts this value to int to test if it is negative.  This makes it
think incorrectly than an error has occurred if the context size
happens to be bigger than 2GB, since this turns into a negative int.

Fix this by having mthca_make_profile() return an s64 and testing
for an error by checking whether this 64-bit value itself is negative.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2008-04-16 21:01:13 -07:00
parent f4f82994d1
commit 19773539d6
3 changed files with 10 additions and 7 deletions
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11
drivers/infiniband/hw/mthca/mthca_main.c
View File

@ -276,6 +276,7 @@ static int mthca_dev_lim(struct mthca_dev *mdev, struct mthca_dev_lim *dev_lim)
static int mthca_init_tavor(struct mthca_dev *mdev)
{
s64 size;
u8 status;
int err;
struct mthca_dev_lim dev_lim;
@ -328,9 +329,11 @@ static int mthca_init_tavor(struct mthca_dev *mdev)
if (mdev->mthca_flags & MTHCA_FLAG_SRQ)
profile.num_srq = dev_lim.max_srqs;
err = mthca_make_profile(mdev, &profile, &dev_lim, &init_hca);
if (err < 0)
size = mthca_make_profile(mdev, &profile, &dev_lim, &init_hca);
if (size < 0) {
err = size;
goto err_disable;
}
err = mthca_INIT_HCA(mdev, &init_hca, &status);
if (err) {
@ -609,7 +612,7 @@ static int mthca_init_arbel(struct mthca_dev *mdev)
struct mthca_dev_lim dev_lim;
struct mthca_profile profile;
struct mthca_init_hca_param init_hca;
u64 icm_size;
s64 icm_size;
u8 status;
int err;
@ -657,7 +660,7 @@ static int mthca_init_arbel(struct mthca_dev *mdev)
profile.num_srq = dev_lim.max_srqs;
icm_size = mthca_make_profile(mdev, &profile, &dev_lim, &init_hca);
if ((int) icm_size < 0) {
if (icm_size < 0) {
err = icm_size;
goto err_stop_fw;
}

4
drivers/infiniband/hw/mthca/mthca_profile.c
View File

@ -63,7 +63,7 @@ enum {
MTHCA_NUM_PDS = 1 << 15
};
u64 mthca_make_profile(struct mthca_dev *dev,
s64 mthca_make_profile(struct mthca_dev *dev,
struct mthca_profile *request,
struct mthca_dev_lim *dev_lim,
struct mthca_init_hca_param *init_hca)
@ -77,7 +77,7 @@ u64 mthca_make_profile(struct mthca_dev *dev,
};
u64 mem_base, mem_avail;
u64 total_size = 0;
s64 total_size = 0;
struct mthca_resource *profile;
struct mthca_resource tmp;
int i, j;

2
drivers/infiniband/hw/mthca/mthca_profile.h
View File

@ -53,7 +53,7 @@ struct mthca_profile {
int fmr_reserved_mtts;
};
u64 mthca_make_profile(struct mthca_dev *mdev,
s64 mthca_make_profile(struct mthca_dev *mdev,
struct mthca_profile *request,
struct mthca_dev_lim *dev_lim,
struct mthca_init_hca_param *init_hca);