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Commit 57bc19ec authored by Andrew Chant's avatar Andrew Chant Committed by John Dias
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sdcardfs: limit stacking depth


Limit filesystem stacking to prevent stack overflow.

Bug: 32761463
Change-Id: I8b1462b9c0d6c7f00cf110724ffb17e7f307c51e
Signed-off-by: default avatarAndrew Chant <achant@google.com>
parent 48a6c91c
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...@@ -223,6 +223,13 @@ static int sdcardfs_read_super(struct super_block *sb, const char *dev_name, ...@@ -223,6 +223,13 @@ static int sdcardfs_read_super(struct super_block *sb, const char *dev_name,
atomic_inc(&lower_sb->s_active); atomic_inc(&lower_sb->s_active);
sdcardfs_set_lower_super(sb, lower_sb); sdcardfs_set_lower_super(sb, lower_sb);
sb->s_stack_depth = lower_sb->s_stack_depth + 1;
if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
pr_err("sdcardfs: maximum fs stacking depth exceeded\n");
err = -EINVAL;
goto out_sput;
}
/* inherit maxbytes from lower file system */ /* inherit maxbytes from lower file system */
sb->s_maxbytes = lower_sb->s_maxbytes; sb->s_maxbytes = lower_sb->s_maxbytes;
... ...
......
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