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xfs: Check the return value of xfs_buf_read() for NULL 

Check the return value of xfs_buf_read() for NULL and return ENOMEM
if it is NULL.  This is necessary in a few spots to avoid subsequent
code blindly dereferencing the null buffer pointer.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Chandra Seetharaman 2011-08-03 02:18:29 +00:00 committed by Alex Elder
parent 9e978d8f7d
commit ac4d6888b2
2 changed files with 8 additions and 0 deletions
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6
fs/xfs/xfs_log_recover.c
View File

@ -2131,6 +2131,8 @@ xlog_recover_buffer_pass2(
bp = xfs_buf_read(mp->m_ddev_targp, buf_f->blf_blkno, buf_f->blf_len,
buf_flags);
if (!bp)
return XFS_ERROR(ENOMEM);
error = xfs_buf_geterror(bp);
if (error) {
xfs_ioerror_alert("xlog_recover_do..(read#1)", mp,
@ -2222,6 +2224,10 @@ xlog_recover_inode_pass2(
bp = xfs_buf_read(mp->m_ddev_targp, in_f->ilf_blkno, in_f->ilf_len,
XBF_LOCK);
if (!bp) {
error = ENOMEM;
goto error;
}
error = xfs_buf_geterror(bp);
if (error) {
xfs_ioerror_alert("xlog_recover_do..(read#2)", mp,

2
fs/xfs/xfs_vnodeops.c
View File

@ -83,6 +83,8 @@ xfs_readlink_bmap(
bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
if (!bp)
return XFS_ERROR(ENOMEM);
error = xfs_buf_geterror(bp);
if (error) {
xfs_ioerror_alert("xfs_readlink",